Attachment 360998 Details for Bug 194189 – Fixed Windows build

[patch] Fixed Windows build

bug-194189-20190202220416.patch (text/plain), 103.17 KB, created by Ryosuke Niwa on 2019-02-02 22:04:17 PST

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Creator: Ryosuke Niwa

Created: 2019-02-02 22:04:17 PST

Size: 103.17 KB

patch

obsolete

>Index: Source/WebCore/ChangeLog
>===================================================================
>--- Source/WebCore/ChangeLog	(revision 240901)
>+++ Source/WebCore/ChangeLog	(working copy)
>@@ -1,3 +1,56 @@
>+2019-02-02  Ryosuke Niwa  <rniwa@webkit.org>
>+
>+        Validate navigation policy decisions to avoid crashes in continueLoadAfterNavigationPolicy
>+        https://bugs.webkit.org/show_bug.cgi?id=194189
>+
>+        Reviewed by Geoffrey Garen.
>+
>+        Introduced PolicyCheckIdentifier to pair each navigation policy check request with a decision,
>+        and deployed it in PolicyChecker. The identifier is passed from WebContent process to UI process
>+        in WebKit2, and passed it back with the policy decision.
>+
>+        Because PolicyCheckIdentifier embeds the process identifier from which a navigation policy is checked,
>+        we would be able to detect when UI process had sent the decision to a wrong WebContent process.
>+
>+        This patch also adds release assertions to make sure history().provisionalItem() is set whenever
>+        we're requesting a navigation policy check.
>+
>+        These code changes should either:
>+        1. Fix crashes in FrameLoader::continueLoadAfterNavigationPolicy where isBackForwardLoadType would
>+           return true yet history().provisionalItem() is null.
>+        2. Detect a bug that UI process can send a navigation policy decision to a wrong WebContent process.
>+        3. Rule out the possibility that (2) exists.
>+
>+        * loader/DocumentLoader.cpp:
>+        (WebCore::DocumentLoader::willSendRequest):
>+        (WebCore::DocumentLoader::responseReceived):
>+        * loader/EmptyClients.cpp:
>+        (WebCore::EmptyFrameLoaderClient::dispatchDecidePolicyForNewWindowAction):
>+        (WebCore::EmptyFrameLoaderClient::dispatchDecidePolicyForNavigationAction):
>+        * loader/EmptyFrameLoaderClient.h:
>+        * loader/FrameLoader.cpp:
>+        (WebCore::FrameLoader::checkContentPolicy):
>+        (WebCore::FrameLoader::loadURL):
>+        (WebCore::FrameLoader::load):
>+        (WebCore::FrameLoader::loadWithDocumentLoader):
>+        (WebCore::FrameLoader::loadPostRequest):
>+        * loader/FrameLoader.h:
>+        * loader/FrameLoaderClient.h:
>+        * loader/FrameLoaderTypes.h:
>+        (WebCore::PolicyCheckIdentifier): Added.
>+        (WebCore::PolicyCheckIdentifier::operator== const): Added.
>+        (WebCore::PolicyCheckIdentifier::PolicyCheckIdentifier): Added.
>+        (WebCore::PolicyCheckIdentifier::encode const): Added.
>+        (WebCore::PolicyCheckIdentifier::decode): Added.
>+        * loader/PolicyChecker.cpp:
>+        (WebCore::PolicyCheckIdentifier::generate):
>+        (WebCore::PolicyCheckIdentifier::isValidFor): Returns true if the identifer matches. Also release asserts
>+        that the process ID is same, and that m_check is always not zero (meaning it's a generated value).
>+        The failure of these release assertions would indicate that there is a bug in UI process, which results in
>+        a policy decision response being sent to a wrong Web process.
>+        (WebCore::PolicyChecker::checkNavigationPolicy): Exit early if isValidFor fails.
>+        (WebCore::PolicyChecker::checkNewWindowPolicy):
>+
> 2019-02-02  Simon Fraser  <simon.fraser@apple.com>
> 
>         Tidy up data memebers of FrameView and related classes to shrink class sizes
>Index: Source/WebCore/loader/DocumentLoader.cpp
>===================================================================
>--- Source/WebCore/loader/DocumentLoader.cpp	(revision 240901)
>+++ Source/WebCore/loader/DocumentLoader.cpp	(working copy)
>@@ -56,6 +56,7 @@
> #include "HTTPHeaderField.h"
> #include "HTTPHeaderNames.h"
> #include "HistoryItem.h"
>+#include "HistoryController.h"
> #include "IconLoader.h"
> #include "InspectorInstrumentation.h"
> #include "LinkIconCollector.h"
>@@ -662,7 +663,10 @@ void DocumentLoader::willSendRequest(Res
>     ASSERT(!m_waitingForNavigationPolicy);
>     m_waitingForNavigationPolicy = true;
> 
>-    frameLoader()->policyChecker().checkNavigationPolicy(WTFMove(newRequest), redirectResponse, WTFMove(navigationPolicyCompletionHandler));
>+    // FIXME: Add a load type check.
>+    auto& policyChecker = frameLoader()->policyChecker();
>+    RELEASE_ASSERT(!isBackForwardLoadType(policyChecker.loadType()) || frameLoader()->history().provisionalItem());
>+    policyChecker.checkNavigationPolicy(WTFMove(newRequest), redirectResponse, WTFMove(navigationPolicyCompletionHandler));
> }
> 
> bool DocumentLoader::tryLoadingRequestFromApplicationCache()
>@@ -839,7 +843,10 @@ void DocumentLoader::responseReceived(co
>     RefPtr<SubresourceLoader> mainResourceLoader = this->mainResourceLoader();
>     if (mainResourceLoader)
>         mainResourceLoader->markInAsyncResponsePolicyCheck();
>-    frameLoader()->checkContentPolicy(m_response, [this, protectedThis = makeRef(*this), mainResourceLoader = WTFMove(mainResourceLoader), completionHandler = completionHandlerCaller.release()] (PolicyAction policy) mutable {
>+    auto requestIdentifier = PolicyCheckIdentifier::create();
>+    frameLoader()->checkContentPolicy(m_response, requestIdentifier, [this, protectedThis = makeRef(*this), mainResourceLoader = WTFMove(mainResourceLoader),
>+        completionHandler = completionHandlerCaller.release(), requestIdentifier] (PolicyAction policy, PolicyCheckIdentifier responseIdentifeir) mutable {
>+        RELEASE_ASSERT(responseIdentifeir.isValidFor(requestIdentifier));
>         continueAfterContentPolicy(policy);
>         if (mainResourceLoader)
>             mainResourceLoader->didReceiveResponsePolicy();
>Index: Source/WebCore/loader/EmptyClients.cpp
>===================================================================
>--- Source/WebCore/loader/EmptyClients.cpp	(revision 240901)
>+++ Source/WebCore/loader/EmptyClients.cpp	(working copy)
>@@ -452,11 +452,11 @@ PAL::SessionID EmptyFrameLoaderClient::s
>     return PAL::SessionID::defaultSessionID();
> }
> 
>-void EmptyFrameLoaderClient::dispatchDecidePolicyForNewWindowAction(const NavigationAction&, const ResourceRequest&, FormState*, const String&, FramePolicyFunction&&)
>+void EmptyFrameLoaderClient::dispatchDecidePolicyForNewWindowAction(const NavigationAction&, const ResourceRequest&, FormState*, const String&, PolicyCheckIdentifier, FramePolicyFunction&&)
> {
> }
> 
>-void EmptyFrameLoaderClient::dispatchDecidePolicyForNavigationAction(const NavigationAction&, const ResourceRequest&, const ResourceResponse&, FormState*, PolicyDecisionMode, FramePolicyFunction&&)
>+void EmptyFrameLoaderClient::dispatchDecidePolicyForNavigationAction(const NavigationAction&, const ResourceRequest&, const ResourceResponse&, FormState*, PolicyDecisionMode, PolicyCheckIdentifier, FramePolicyFunction&&)
> {
> }
> 
>Index: Source/WebCore/loader/EmptyFrameLoaderClient.h
>===================================================================
>--- Source/WebCore/loader/EmptyFrameLoaderClient.h	(revision 240901)
>+++ Source/WebCore/loader/EmptyFrameLoaderClient.h	(working copy)
>@@ -93,9 +93,9 @@ class WEBCORE_EXPORT EmptyFrameLoaderCli
>     Frame* dispatchCreatePage(const NavigationAction&) final { return nullptr; }
>     void dispatchShow() final { }
> 
>-    void dispatchDecidePolicyForResponse(const ResourceResponse&, const ResourceRequest&, FramePolicyFunction&&) final { }
>-    void dispatchDecidePolicyForNewWindowAction(const NavigationAction&, const ResourceRequest&, FormState*, const String&, FramePolicyFunction&&) final;
>-    void dispatchDecidePolicyForNavigationAction(const NavigationAction&, const ResourceRequest&, const ResourceResponse& redirectResponse, FormState*, PolicyDecisionMode, FramePolicyFunction&&) final;
>+    void dispatchDecidePolicyForResponse(const ResourceResponse&, const ResourceRequest&, PolicyCheckIdentifier, FramePolicyFunction&&) final { }
>+    void dispatchDecidePolicyForNewWindowAction(const NavigationAction&, const ResourceRequest&, FormState*, const String&, PolicyCheckIdentifier, FramePolicyFunction&&) final;
>+    void dispatchDecidePolicyForNavigationAction(const NavigationAction&, const ResourceRequest&, const ResourceResponse& redirectResponse, FormState*, PolicyDecisionMode, PolicyCheckIdentifier, FramePolicyFunction&&) final;
>     void cancelPolicyCheck() final { }
> 
>     void dispatchUnableToImplementPolicy(const ResourceError&) final { }
>Index: Source/WebCore/loader/FrameLoader.cpp
>===================================================================
>--- Source/WebCore/loader/FrameLoader.cpp	(revision 240901)
>+++ Source/WebCore/loader/FrameLoader.cpp	(working copy)
>@@ -363,15 +363,16 @@ void FrameLoader::setDefersLoading(bool 
>     }
> }
> 
>-void FrameLoader::checkContentPolicy(const ResourceResponse& response, ContentPolicyDecisionFunction&& function)
>+void FrameLoader::checkContentPolicy(const ResourceResponse& response, PolicyCheckIdentifier identifier, ContentPolicyDecisionFunction&& function)
> {
>     if (!activeDocumentLoader()) {
>         // Load was cancelled
>-        function(PolicyAction::Ignore);
>+        function(PolicyAction::Ignore, identifier);
>         return;
>     }
> 
>-    client().dispatchDecidePolicyForResponse(response, activeDocumentLoader()->request(), WTFMove(function));
>+    // FIXME: Validate the policy check identifier.
>+    client().dispatchDecidePolicyForResponse(response, activeDocumentLoader()->request(), identifier, WTFMove(function));
> }
> 
> void FrameLoader::changeLocation(FrameLoadRequest&& request)
>@@ -1378,6 +1379,7 @@ void FrameLoader::loadURL(FrameLoadReque
> 
>     if (!targetFrame && !effectiveFrameName.isEmpty()) {
>         action = action.copyWithShouldOpenExternalURLsPolicy(shouldOpenExternalURLsPolicyToApply(m_frame, frameLoadRequest));
>+        RELEASE_ASSERT(!isBackForwardLoadType(policyChecker().loadType()));
>         policyChecker().checkNewWindowPolicy(WTFMove(action), WTFMove(request), WTFMove(formState), effectiveFrameName, [this, allowNavigationToInvalidURL, openerPolicy, completionHandler = completionHandlerCaller.release()] (const ResourceRequest& request, WeakPtr<FormState>&& formState, const String& frameName, const NavigationAction& action, ShouldContinue shouldContinue) mutable {
>             continueLoadAfterNewWindowPolicy(request, formState.get(), frameName, action, shouldContinue, allowNavigationToInvalidURL, openerPolicy);
>             completionHandler();
>@@ -1398,6 +1400,7 @@ void FrameLoader::loadURL(FrameLoadReque
>         oldDocumentLoader->setLastCheckedRequest(ResourceRequest());
>         policyChecker().stopCheck();
>         policyChecker().setLoadType(newLoadType);
>+        RELEASE_ASSERT(!isBackForwardLoadType(newLoadType) || history().provisionalItem());
>         policyChecker().checkNavigationPolicy(WTFMove(request), ResourceResponse { } /* redirectResponse */, oldDocumentLoader.get(), WTFMove(formState), [this, protectedFrame = makeRef(m_frame)] (const ResourceRequest& request, WeakPtr<FormState>&&, NavigationPolicyDecision navigationPolicyDecision) {
>             continueFragmentScrollAfterNavigationPolicy(request, navigationPolicyDecision == NavigationPolicyDecision::ContinueLoad);
>         }, PolicyDecisionMode::Synchronous);
>@@ -1461,6 +1464,7 @@ void FrameLoader::load(FrameLoadRequest&
> 
>     if (request.shouldCheckNewWindowPolicy()) {
>         NavigationAction action { request.requester(), request.resourceRequest(), InitiatedByMainFrame::Unknown, NavigationType::Other, request.shouldOpenExternalURLsPolicy() };
>+        RELEASE_ASSERT(!isBackForwardLoadType(policyChecker().loadType()));
>         policyChecker().checkNewWindowPolicy(WTFMove(action), WTFMove(request.resourceRequest()), { }, request.frameName(), [this] (const ResourceRequest& request, WeakPtr<FormState>&& formState, const String& frameName, const NavigationAction& action, ShouldContinue shouldContinue) {
>             continueLoadAfterNewWindowPolicy(request, formState.get(), frameName, action, shouldContinue, AllowNavigationToInvalidURL::Yes, NewFrameOpenerPolicy::Suppress);
>         });
>@@ -1584,6 +1588,7 @@ void FrameLoader::loadWithDocumentLoader
>     }
> 
>     policyChecker().setLoadType(type);
>+    RELEASE_ASSERT(!isBackForwardLoadType(type) || history().provisionalItem());
>     bool isFormSubmission = formState;
> 
>     const String& httpMethod = loader->request().httpMethod();
>@@ -1595,6 +1600,7 @@ void FrameLoader::loadWithDocumentLoader
>         oldDocumentLoader->setTriggeringAction(WTFMove(action));
>         oldDocumentLoader->setLastCheckedRequest(ResourceRequest());
>         policyChecker().stopCheck();
>+        RELEASE_ASSERT(!isBackForwardLoadType(policyChecker().loadType()) || history().provisionalItem());
>         policyChecker().checkNavigationPolicy(ResourceRequest(loader->request()), ResourceResponse { }  /* redirectResponse */, oldDocumentLoader.get(), WTFMove(formState), [this, protectedFrame = makeRef(m_frame)] (const ResourceRequest& request, WeakPtr<FormState>&&, NavigationPolicyDecision navigationPolicyDecision) {
>             continueFragmentScrollAfterNavigationPolicy(request, navigationPolicyDecision == NavigationPolicyDecision::ContinueLoad);
>         }, PolicyDecisionMode::Synchronous);
>@@ -1629,6 +1635,7 @@ void FrameLoader::loadWithDocumentLoader
>         return;
>     }
> 
>+    RELEASE_ASSERT(!isBackForwardLoadType(policyChecker().loadType()) || history().provisionalItem());
>     policyChecker().checkNavigationPolicy(ResourceRequest(loader->request()), ResourceResponse { } /* redirectResponse */, loader, WTFMove(formState), [this, protectedFrame = makeRef(m_frame), allowNavigationToInvalidURL, completionHandler = completionHandlerCaller.release()] (const ResourceRequest& request, WeakPtr<FormState>&& formState, NavigationPolicyDecision navigationPolicyDecision) mutable {
>         continueLoadAfterNavigationPolicy(request, formState.get(), navigationPolicyDecision, allowNavigationToInvalidURL);
>         completionHandler();
>@@ -3010,6 +3017,7 @@ void FrameLoader::loadPostRequest(FrameL
>             return;
>         }
> 
>+        RELEASE_ASSERT(!isBackForwardLoadType(policyChecker().loadType()));
>         policyChecker().checkNewWindowPolicy(WTFMove(action), WTFMove(workingResourceRequest), WTFMove(formState), frameName, [this, allowNavigationToInvalidURL, openerPolicy, completionHandler = WTFMove(completionHandler)] (const ResourceRequest& request, WeakPtr<FormState>&& formState, const String& frameName, const NavigationAction& action, ShouldContinue shouldContinue) mutable {
>             continueLoadAfterNewWindowPolicy(request, formState.get(), frameName, action, shouldContinue, allowNavigationToInvalidURL, openerPolicy);
>             completionHandler();
>Index: Source/WebCore/loader/FrameLoader.h
>===================================================================
>--- Source/WebCore/loader/FrameLoader.h	(revision 240901)
>+++ Source/WebCore/loader/FrameLoader.h	(working copy)
>@@ -92,7 +92,7 @@ struct WindowFeatures;
> WEBCORE_EXPORT bool isBackForwardLoadType(FrameLoadType);
> WEBCORE_EXPORT bool isReload(FrameLoadType);
> 
>-using ContentPolicyDecisionFunction = WTF::Function<void(PolicyAction)>;
>+using ContentPolicyDecisionFunction = WTF::Function<void(PolicyAction, PolicyCheckIdentifier)>;
> 
> class FrameLoader {
>     WTF_MAKE_NONCOPYABLE(FrameLoader);
>@@ -224,7 +224,7 @@ public:
> 
>     void setDefersLoading(bool);
> 
>-    void checkContentPolicy(const ResourceResponse&, ContentPolicyDecisionFunction&&);
>+    void checkContentPolicy(const ResourceResponse&, PolicyCheckIdentifier, ContentPolicyDecisionFunction&&);
> 
>     void didExplicitOpen();
> 
>Index: Source/WebCore/loader/FrameLoaderClient.h
>===================================================================
>--- Source/WebCore/loader/FrameLoaderClient.h	(revision 240901)
>+++ Source/WebCore/loader/FrameLoaderClient.h	(working copy)
>@@ -107,7 +107,7 @@ enum class PolicyDecisionMode;
> 
> struct StringWithDirection;
> 
>-typedef WTF::Function<void (PolicyAction)> FramePolicyFunction;
>+typedef WTF::Function<void (PolicyAction, PolicyCheckIdentifier)> FramePolicyFunction;
> 
> class WEBCORE_EXPORT FrameLoaderClient {
> public:
>@@ -190,9 +190,9 @@ public:
>     virtual Frame* dispatchCreatePage(const NavigationAction&) = 0;
>     virtual void dispatchShow() = 0;
> 
>-    virtual void dispatchDecidePolicyForResponse(const ResourceResponse&, const ResourceRequest&, FramePolicyFunction&&) = 0;
>-    virtual void dispatchDecidePolicyForNewWindowAction(const NavigationAction&, const ResourceRequest&, FormState*, const String& frameName, FramePolicyFunction&&) = 0;
>-    virtual void dispatchDecidePolicyForNavigationAction(const NavigationAction&, const ResourceRequest&, const ResourceResponse& redirectResponse, FormState*, PolicyDecisionMode, FramePolicyFunction&&) = 0;
>+    virtual void dispatchDecidePolicyForResponse(const ResourceResponse&, const ResourceRequest&, PolicyCheckIdentifier, FramePolicyFunction&&) = 0;
>+    virtual void dispatchDecidePolicyForNewWindowAction(const NavigationAction&, const ResourceRequest&, FormState*, const String& frameName, PolicyCheckIdentifier, FramePolicyFunction&&) = 0;
>+    virtual void dispatchDecidePolicyForNavigationAction(const NavigationAction&, const ResourceRequest&, const ResourceResponse& redirectResponse, FormState*, PolicyDecisionMode, PolicyCheckIdentifier, FramePolicyFunction&&) = 0;
>     virtual void cancelPolicyCheck() = 0;
> 
>     virtual void dispatchUnableToImplementPolicy(const ResourceError&) = 0;
>Index: Source/WebCore/loader/FrameLoaderTypes.h
>===================================================================
>--- Source/WebCore/loader/FrameLoaderTypes.h	(revision 240901)
>+++ Source/WebCore/loader/FrameLoaderTypes.h	(working copy)
>@@ -29,6 +29,7 @@
> #pragma once
> 
> #include "IntRect.h"
>+#include "ProcessIdentifier.h"
> 
> namespace WebCore {
> 
>@@ -66,6 +67,48 @@ enum class FrameLoadType : uint8_t {
>     ReloadExpiredOnly
> };
> 
>+class PolicyCheckIdentifier {
>+public:
>+    PolicyCheckIdentifier() = default;
>+
>+    static PolicyCheckIdentifier create();
>+
>+    bool isValidFor(PolicyCheckIdentifier);
>+    bool operator==(const PolicyCheckIdentifier& other) const { return m_process == other.m_process && m_policyCheck == other.m_policyCheck; }
>+
>+    template<class Encoder> void encode(Encoder&) const;
>+    template<class Decoder> static Optional<PolicyCheckIdentifier> decode(Decoder&);
>+
>+private:
>+    PolicyCheckIdentifier(ProcessIdentifier process, uint64_t policyCheck)
>+        : m_process(process)
>+        , m_policyCheck(policyCheck)
>+    { }
>+
>+    ProcessIdentifier m_process;
>+    uint64_t m_policyCheck { 0 };
>+};
>+
>+template<class Encoder>
>+void PolicyCheckIdentifier::encode(Encoder& encoder) const
>+{
>+    encoder << m_process << m_policyCheck;
>+}
>+
>+template<class Decoder>
>+Optional<PolicyCheckIdentifier> PolicyCheckIdentifier::decode(Decoder& decoder)
>+{
>+    auto process = ProcessIdentifier::decode(decoder);
>+    if (!process)
>+        return WTF::nullopt;
>+
>+    uint64_t policyCheck;
>+    if (!decoder.decode(policyCheck))
>+        return WTF::nullopt;
>+
>+    return PolicyCheckIdentifier { *process, policyCheck };
>+}
>+
> enum class NewFrameOpenerPolicy : uint8_t {
>     Suppress,
>     Allow
>Index: Source/WebCore/loader/PolicyChecker.cpp
>===================================================================
>--- Source/WebCore/loader/PolicyChecker.cpp	(revision 240901)
>+++ Source/WebCore/loader/PolicyChecker.cpp	(working copy)
>@@ -71,6 +71,21 @@ static bool isAllowedByContentSecurityPo
>     return ownerElement->document().contentSecurityPolicy()->allowChildFrameFromSource(url, redirectResponseReceived);
> }
> 
>+PolicyCheckIdentifier PolicyCheckIdentifier::create()
>+{
>+    static uint64_t identifier = 0;
>+    identifier++;
>+    return PolicyCheckIdentifier { Process::identifier(), identifier };
>+}
>+
>+bool PolicyCheckIdentifier::isValidFor(PolicyCheckIdentifier expectedIdentifier)
>+{
>+    RELEASE_ASSERT_WITH_MESSAGE(m_process == expectedIdentifier.m_process, "Received a policy check response for a wrong process");
>+    RELEASE_ASSERT_WITH_MESSAGE(m_policyCheck, "Received 0 as the policy check identifier");
>+    RELEASE_ASSERT_WITH_MESSAGE(m_policyCheck <= expectedIdentifier.m_policyCheck, "Received a policy check response from the future");
>+    return m_policyCheck == expectedIdentifier.m_policyCheck;
>+}
>+
> PolicyChecker::PolicyChecker(Frame& frame)
>     : m_frame(frame)
>     , m_delegateIsDecidingNavigationPolicy(false)
>@@ -170,9 +185,16 @@ void PolicyChecker::checkNavigationPolic
> 
>     auto blobURLLifetimeExtension = policyDecisionMode == PolicyDecisionMode::Asynchronous ? extendBlobURLLifetimeIfNecessary(request) : CompletionHandlerCallingScope { };
> 
>+    auto requestIdentifier = PolicyCheckIdentifier::create();
>     m_delegateIsDecidingNavigationPolicy = true;
>     String suggestedFilename = action.downloadAttribute().isEmpty() ? nullAtom() : action.downloadAttribute();
>-    m_frame.loader().client().dispatchDecidePolicyForNavigationAction(action, request, redirectResponse, formState.get(), policyDecisionMode, [this, function = WTFMove(function), request = ResourceRequest(request), formState = WTFMove(formState), suggestedFilename = WTFMove(suggestedFilename), blobURLLifetimeExtension = WTFMove(blobURLLifetimeExtension)](PolicyAction policyAction) mutable {
>+    m_frame.loader().client().dispatchDecidePolicyForNavigationAction(action, request, redirectResponse, formState.get(), policyDecisionMode, requestIdentifier,
>+        [this, function = WTFMove(function), request = ResourceRequest(request), formState = WTFMove(formState), suggestedFilename = WTFMove(suggestedFilename),
>+         blobURLLifetimeExtension = WTFMove(blobURLLifetimeExtension), requestIdentifier] (PolicyAction policyAction, PolicyCheckIdentifier responseIdentifier) mutable {
>+
>+        if (!responseIdentifier.isValidFor(requestIdentifier))
>+            return;
>+
>         m_delegateIsDecidingNavigationPolicy = false;
> 
>         switch (policyAction) {
>@@ -206,7 +228,14 @@ void PolicyChecker::checkNewWindowPolicy
> 
>     auto blobURLLifetimeExtension = extendBlobURLLifetimeIfNecessary(request);
> 
>-    m_frame.loader().client().dispatchDecidePolicyForNewWindowAction(navigationAction, request, formState.get(), frameName, [frame = makeRef(m_frame), request, formState = WTFMove(formState), frameName, navigationAction, function = WTFMove(function), blobURLLifetimeExtension = WTFMove(blobURLLifetimeExtension)](PolicyAction policyAction) mutable {
>+    auto requestIdentifier = PolicyCheckIdentifier::create();
>+    m_frame.loader().client().dispatchDecidePolicyForNewWindowAction(navigationAction, request, formState.get(), frameName, requestIdentifier, [frame = makeRef(m_frame), request,
>+        formState = WTFMove(formState), frameName, navigationAction, function = WTFMove(function), blobURLLifetimeExtension = WTFMove(blobURLLifetimeExtension),
>+        requestIdentifier] (PolicyAction policyAction, PolicyCheckIdentifier responseIdentifier) mutable {
>+
>+        if (!responseIdentifier.isValidFor(requestIdentifier))
>+            return;
>+
>         switch (policyAction) {
>         case PolicyAction::Download:
>             frame->loader().client().startDownload(request);
>Index: Source/WebKit/ChangeLog
>===================================================================
>--- Source/WebKit/ChangeLog	(revision 240901)
>+++ Source/WebKit/ChangeLog	(working copy)
>@@ -1,3 +1,51 @@
>+2019-02-02  Ryosuke Niwa  <rniwa@webkit.org>
>+
>+        Validate navigation policy decisions to avoid crashes in continueLoadAfterNavigationPolicy
>+        https://bugs.webkit.org/show_bug.cgi?id=194189
>+
>+        Reviewed by Geoffrey Garen.
>+
>+        Pass the policy check identifier around functions and store it in PolicyDecisionSender
>+        so that we can send it back to WebCore with the navigation policy decision.
>+
>+        We also store it in WebFrame in the case the policy decision had to be invalidated
>+        before the decision was received (via WebFrame::invalidatePolicyListener).
>+
>+        * Scripts/webkit/messages.py:
>+        * UIProcess/ProvisionalPageProxy.cpp:
>+        (WebKit::ProvisionalPageProxy::decidePolicyForNavigationActionAsync):
>+        (WebKit::ProvisionalPageProxy::decidePolicyForResponse):
>+        * UIProcess/ProvisionalPageProxy.h:
>+        * UIProcess/WebPageProxy.cpp:
>+        (WebKit::WebPageProxy::PolicyDecisionSender): Added PolicyCheckIdentifier as a member.
>+        (WebKit::WebPageProxy::PolicyDecisionSender::create):
>+        (WebKit::WebPageProxy::PolicyDecisionSender::send):
>+        (WebKit::WebPageProxy::PolicyDecisionSender::PolicyDecisionSender):
>+        (WebKit::WebPageProxy::receivedNavigationPolicyDecision):
>+        (WebKit::WebPageProxy::decidePolicyForNavigationActionAsync):
>+        (WebKit::WebPageProxy::decidePolicyForNavigationActionAsyncShared):
>+        (WebKit::WebPageProxy::decidePolicyForNavigationAction):
>+        (WebKit::WebPageProxy::decidePolicyForNavigationActionSync):
>+        (WebKit::WebPageProxy::decidePolicyForNewWindowAction):
>+        (WebKit::WebPageProxy::decidePolicyForResponse):
>+        (WebKit::WebPageProxy::decidePolicyForResponseShared):
>+        * UIProcess/WebPageProxy.h:
>+        * UIProcess/WebPageProxy.messages.in:
>+        * WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp:
>+        (WebKit::WebFrameLoaderClient::dispatchDecidePolicyForResponse):
>+        (WebKit::WebFrameLoaderClient::dispatchDecidePolicyForNewWindowAction):
>+        (WebKit::WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction):
>+        * WebProcess/WebCoreSupport/WebFrameLoaderClient.h:
>+        * WebProcess/WebPage/WebFrame.cpp:
>+        (WebKit::WebFrame::setUpPolicyListener):
>+        (WebKit::WebFrame::invalidatePolicyListener):
>+        (WebKit::WebFrame::didReceivePolicyDecision):
>+        * WebProcess/WebPage/WebFrame.h:
>+        * WebProcess/WebPage/WebPage.cpp:
>+        (WebKit::WebPage::didReceivePolicyDecision):
>+        * WebProcess/WebPage/WebPage.h:
>+        * WebProcess/WebPage/WebPage.messages.in:
>+
> 2019-02-02  Simon Fraser  <simon.fraser@apple.com>
> 
>         Tidy up data memebers of FrameView and related classes to shrink class sizes
>Index: Source/WebKit/Scripts/webkit/messages.py
>===================================================================
>--- Source/WebKit/Scripts/webkit/messages.py	(revision 240901)
>+++ Source/WebKit/Scripts/webkit/messages.py	(working copy)
>@@ -420,6 +420,7 @@ def headers_for_type(type):
>         'WebCore::PaymentMethodUpdate': ['<WebCore/ApplePaySessionPaymentRequest.h>'],
>         'WebCore::PluginInfo': ['<WebCore/PluginData.h>'],
>         'WebCore::PolicyAction': ['<WebCore/FrameLoaderTypes.h>'],
>+        'WebCore::PolicyCheckIdentifier': ['<WebCore/FrameLoaderTypes.h>'],
>         'WebCore::RecentSearch': ['<WebCore/SearchPopupMenu.h>'],
>         'WebCore::RouteSharingPolicy': ['<WebCore/AudioSession.h>'],
>         'WebCore::SWServerConnectionIdentifier': ['<WebCore/ServiceWorkerTypes.h>'],
>Index: Source/WebKit/UIProcess/ProvisionalPageProxy.cpp
>===================================================================
>--- Source/WebKit/UIProcess/ProvisionalPageProxy.cpp	(revision 240901)
>+++ Source/WebKit/UIProcess/ProvisionalPageProxy.cpp	(working copy)
>@@ -262,16 +262,20 @@ void ProvisionalPageProxy::didChangeProv
>     m_page.didChangeProvisionalURLForFrameShared(m_process.copyRef(), frameID, navigationID, WTFMove(url));
> }
> 
>-void ProvisionalPageProxy::decidePolicyForNavigationActionAsync(uint64_t frameID, WebCore::SecurityOriginData&& frameSecurityOrigin, uint64_t navigationID, NavigationActionData&& navigationActionData, FrameInfoData&& frameInfoData, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&& request, IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData& userData, uint64_t listenerID)
>+void ProvisionalPageProxy::decidePolicyForNavigationActionAsync(uint64_t frameID, WebCore::SecurityOriginData&& frameSecurityOrigin, WebCore::PolicyCheckIdentifier identifier,
>+    uint64_t navigationID, NavigationActionData&& navigationActionData, FrameInfoData&& frameInfoData, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest,
>+    WebCore::ResourceRequest&& request, IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData& userData, uint64_t listenerID)
> {
>     ASSERT(m_mainFrame);
>     ASSERT(m_mainFrame->frameID() == frameID);
>-    m_page.decidePolicyForNavigationActionAsyncShared(m_process.copyRef(), frameID, WTFMove(frameSecurityOrigin), navigationID, WTFMove(navigationActionData), WTFMove(frameInfoData), originatingPageID, originalRequest, WTFMove(request), WTFMove(requestBody), WTFMove(redirectResponse), userData, listenerID);
>+    m_page.decidePolicyForNavigationActionAsyncShared(m_process.copyRef(), frameID, WTFMove(frameSecurityOrigin), identifier, navigationID, WTFMove(navigationActionData),
>+        WTFMove(frameInfoData), originatingPageID, originalRequest, WTFMove(request), WTFMove(requestBody), WTFMove(redirectResponse), userData, listenerID);
> }
> 
>-void ProvisionalPageProxy::decidePolicyForResponse(uint64_t frameID, const WebCore::SecurityOriginData& frameSecurityOrigin, uint64_t navigationID, const WebCore::ResourceResponse& response, const WebCore::ResourceRequest& request, bool canShowMIMEType, uint64_t listenerID, const UserData& userData)
>+void ProvisionalPageProxy::decidePolicyForResponse(uint64_t frameID, const WebCore::SecurityOriginData& frameSecurityOrigin, WebCore::PolicyCheckIdentifier identifier,
>+    uint64_t navigationID, const WebCore::ResourceResponse& response, const WebCore::ResourceRequest& request, bool canShowMIMEType, uint64_t listenerID, const UserData& userData)
> {
>-    m_page.decidePolicyForResponseShared(m_process.copyRef(), frameID, frameSecurityOrigin, navigationID, response, request, canShowMIMEType, listenerID, userData);
>+    m_page.decidePolicyForResponseShared(m_process.copyRef(), frameID, frameSecurityOrigin, identifier, navigationID, response, request, canShowMIMEType, listenerID, userData);
> }
> 
> void ProvisionalPageProxy::startURLSchemeTask(URLSchemeTaskParameters&& parameters)
>Index: Source/WebKit/UIProcess/ProvisionalPageProxy.h
>===================================================================
>--- Source/WebKit/UIProcess/ProvisionalPageProxy.h	(revision 240901)
>+++ Source/WebKit/UIProcess/ProvisionalPageProxy.h	(working copy)
>@@ -73,8 +73,11 @@ private:
>     void didReceiveMessage(IPC::Connection&, IPC::Decoder&) final;
>     void didReceiveSyncMessage(IPC::Connection&, IPC::Decoder&, std::unique_ptr<IPC::Encoder>&) final;
> 
>-    void decidePolicyForNavigationActionAsync(uint64_t frameID, WebCore::SecurityOriginData&& frameSecurityOrigin, uint64_t navigationID, NavigationActionData&&, FrameInfoData&&, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&&, IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData&, uint64_t listenerID);
>-    void decidePolicyForResponse(uint64_t frameID, const WebCore::SecurityOriginData& frameSecurityOrigin, uint64_t navigationID, const WebCore::ResourceResponse&, const WebCore::ResourceRequest&, bool canShowMIMEType, uint64_t listenerID, const UserData&);
>+    void decidePolicyForNavigationActionAsync(uint64_t frameID, WebCore::SecurityOriginData&&, WebCore::PolicyCheckIdentifier, uint64_t navigationID, NavigationActionData&&, FrameInfoData&&,
>+        uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&&, IPC::FormDataReference&& requestBody,
>+        WebCore::ResourceResponse&& redirectResponse, const UserData&, uint64_t listenerID);
>+    void decidePolicyForResponse(uint64_t frameID, const WebCore::SecurityOriginData&, WebCore::PolicyCheckIdentifier, uint64_t navigationID, const WebCore::ResourceResponse&,
>+        const WebCore::ResourceRequest&, bool canShowMIMEType, uint64_t listenerID, const UserData&);
>     void didChangeProvisionalURLForFrame(uint64_t frameID, uint64_t navigationID, URL&&);
>     void didNavigateWithNavigationData(const WebNavigationDataStore&, uint64_t frameID);
>     void didPerformClientRedirect(const String& sourceURLString, const String& destinationURLString, uint64_t frameID);
>Index: Source/WebKit/UIProcess/WebPageProxy.cpp
>===================================================================
>--- Source/WebKit/UIProcess/WebPageProxy.cpp	(revision 240901)
>+++ Source/WebKit/UIProcess/WebPageProxy.cpp	(working copy)
>@@ -2674,22 +2674,26 @@ void WebPageProxy::centerSelectionInVisi
> 
> class WebPageProxy::PolicyDecisionSender : public RefCounted<PolicyDecisionSender> {
> public:
>-    using SendFunction = CompletionHandler<void(PolicyAction, uint64_t newNavigationID, DownloadID, Optional<WebsitePoliciesData>)>;
>-    static Ref<PolicyDecisionSender> create(SendFunction&& sendFunction)
>+    using SendFunction = CompletionHandler<void(PolicyCheckIdentifier, PolicyAction, uint64_t newNavigationID, DownloadID, Optional<WebsitePoliciesData>)>;
>+
>+    static Ref<PolicyDecisionSender> create(PolicyCheckIdentifier identifier, SendFunction&& sendFunction)
>     {
>-        return adoptRef(*new PolicyDecisionSender(WTFMove(sendFunction)));
>+        return adoptRef(*new PolicyDecisionSender(identifier, WTFMove(sendFunction)));
>     }
> 
>     template<typename... Args> void send(Args... args)
>     {
>         if (m_sendFunction)
>-            m_sendFunction(std::forward<Args>(args)...);
>+            m_sendFunction(m_identifier, std::forward<Args>(args)...);
>     }
> private:
>-    PolicyDecisionSender(SendFunction sendFunction)
>-        : m_sendFunction(WTFMove(sendFunction)) { }
>+    PolicyDecisionSender(PolicyCheckIdentifier identifier, SendFunction sendFunction)
>+        : m_sendFunction(WTFMove(sendFunction))
>+        , m_identifier(identifier)
>+        { }
> 
>     SendFunction m_sendFunction;
>+    PolicyCheckIdentifier m_identifier;
> };
> 
> void WebPageProxy::receivedNavigationPolicyDecision(PolicyAction policyAction, API::Navigation* navigation, ProcessSwapRequestedByClient processSwapRequestedByClient, WebFrameProxy& frame, API::WebsitePolicies* policies, Ref<PolicyDecisionSender>&& sender)
>@@ -2709,7 +2713,8 @@ void WebPageProxy::receivedNavigationPol
>         return;
>     }
> 
>-    process().processPool().processForNavigation(*this, *navigation, processSwapRequestedByClient, [this, protectedThis = makeRef(*this), policyAction, navigation = makeRef(*navigation), data = WTFMove(data), sender = WTFMove(sender), processSwapRequestedByClient](Ref<WebProcessProxy>&& processForNavigation, SuspendedPageProxy* destinationSuspendedPage, const String& reason) mutable {
>+    process().processPool().processForNavigation(*this, *navigation, processSwapRequestedByClient, [this, protectedThis = makeRef(*this), policyAction, navigation = makeRef(*navigation),
>+        data = WTFMove(data), sender = WTFMove(sender), processSwapRequestedByClient] (Ref<WebProcessProxy>&& processForNavigation, SuspendedPageProxy* destinationSuspendedPage, const String& reason) mutable {
>         // If the navigation has been destroyed, then no need to proceed.
>         if (isClosed() || !navigationState().hasNavigation(navigation->navigationID())) {
>             receivedPolicyDecision(policyAction, navigation.ptr(), WTFMove(data), WTFMove(sender));
>@@ -4355,22 +4360,33 @@ void WebPageProxy::beginSafeBrowsingChec
> }
> #endif
> 
>-void WebPageProxy::decidePolicyForNavigationActionAsync(uint64_t frameID, WebCore::SecurityOriginData&& frameSecurityOrigin, uint64_t navigationID, NavigationActionData&& navigationActionData, FrameInfoData&& frameInfoData, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&& request, IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData& userData, uint64_t listenerID)
>-{
>-    decidePolicyForNavigationActionAsyncShared(m_process.copyRef(), frameID, WTFMove(frameSecurityOrigin), navigationID, WTFMove(navigationActionData), WTFMove(frameInfoData), originatingPageID, originalRequest, WTFMove(request), WTFMove(requestBody), WTFMove(redirectResponse), userData, listenerID);
>+void WebPageProxy::decidePolicyForNavigationActionAsync(uint64_t frameID, WebCore::SecurityOriginData&& frameSecurityOrigin, PolicyCheckIdentifier identifier, uint64_t navigationID,
>+    NavigationActionData&& navigationActionData, FrameInfoData&& frameInfoData, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&& request,
>+    IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData& userData, uint64_t listenerID)
>+{
>+    decidePolicyForNavigationActionAsyncShared(m_process.copyRef(), frameID, WTFMove(frameSecurityOrigin), identifier, navigationID, WTFMove(navigationActionData),
>+        WTFMove(frameInfoData), originatingPageID, originalRequest, WTFMove(request), WTFMove(requestBody), WTFMove(redirectResponse), userData, listenerID);
> }
> 
>-void WebPageProxy::decidePolicyForNavigationActionAsyncShared(Ref<WebProcessProxy>&& process, uint64_t frameID, WebCore::SecurityOriginData&& frameSecurityOrigin, uint64_t navigationID, NavigationActionData&& navigationActionData, FrameInfoData&& frameInfoData, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&& request, IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData& userData, uint64_t listenerID)
>+void WebPageProxy::decidePolicyForNavigationActionAsyncShared(Ref<WebProcessProxy>&& process, uint64_t frameID, WebCore::SecurityOriginData&& frameSecurityOrigin,
>+    WebCore::PolicyCheckIdentifier identifier, uint64_t navigationID, NavigationActionData&& navigationActionData, FrameInfoData&& frameInfoData, uint64_t originatingPageID,
>+    const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&& request, IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse,
>+    const UserData& userData, uint64_t listenerID)
> {
>     auto* frame = process->webFrame(frameID);
>     MESSAGE_CHECK(process, frame);
> 
>-    decidePolicyForNavigationAction(process.copyRef(), *frame, WTFMove(frameSecurityOrigin), navigationID, WTFMove(navigationActionData), WTFMove(frameInfoData), originatingPageID, originalRequest, WTFMove(request), WTFMove(requestBody), WTFMove(redirectResponse), userData, PolicyDecisionSender::create([this, protectedThis = makeRef(*this), frameID, listenerID, process = process.copyRef()] (auto... args) {
>+    auto sender = PolicyDecisionSender::create(identifier, [this, protectedThis = makeRef(*this), frameID, listenerID, process = process.copyRef()] (auto... args) {
>         process->send(Messages::WebPage::DidReceivePolicyDecision(frameID, listenerID, args...), m_pageID);
>-    }));
>+    });
>+
>+    decidePolicyForNavigationAction(process.copyRef(), *frame, WTFMove(frameSecurityOrigin), navigationID, WTFMove(navigationActionData), WTFMove(frameInfoData), originatingPageID,
>+        originalRequest, WTFMove(request), WTFMove(requestBody), WTFMove(redirectResponse), userData, WTFMove(sender));
> }
> 
>-void WebPageProxy::decidePolicyForNavigationAction(Ref<WebProcessProxy>&& process, WebFrameProxy& frame, WebCore::SecurityOriginData&& frameSecurityOrigin, uint64_t navigationID, NavigationActionData&& navigationActionData, FrameInfoData&& originatingFrameInfoData, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&& request, IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData& userData, Ref<PolicyDecisionSender>&& sender)
>+void WebPageProxy::decidePolicyForNavigationAction(Ref<WebProcessProxy>&& process, WebFrameProxy& frame, WebCore::SecurityOriginData&& frameSecurityOrigin, uint64_t navigationID,
>+    NavigationActionData&& navigationActionData, FrameInfoData&& originatingFrameInfoData, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&& request,
>+    IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData& userData, Ref<PolicyDecisionSender>&& sender)
> {
>     LOG(Loading, "WebPageProxy::decidePolicyForNavigationAction - Original URL %s, current target URL %s", originalRequest.url().string().utf8().data(), request.url().string().utf8().data());
> 
>@@ -4429,7 +4445,7 @@ void WebPageProxy::decidePolicyForNaviga
>         shouldExpectSafeBrowsingResult = ShouldExpectSafeBrowsingResult::No;
> 
>     auto listener = makeRef(frame.setUpPolicyListenerProxy([this, protectedThis = makeRef(*this), frame = makeRef(frame), sender = WTFMove(sender), navigation] (PolicyAction policyAction, API::WebsitePolicies* policies, ProcessSwapRequestedByClient processSwapRequestedByClient, RefPtr<SafeBrowsingWarning>&& safeBrowsingWarning) mutable {
>-        
>+
>         auto completionHandler = [this, protectedThis = protectedThis.copyRef(), frame = frame.copyRef(), sender = WTFMove(sender), navigation = WTFMove(navigation), processSwapRequestedByClient, policies = makeRefPtr(policies)] (PolicyAction policyAction) mutable {
>             receivedNavigationPolicyDecision(policyAction, navigation.get(), processSwapRequestedByClient, frame, policies.get(), WTFMove(sender));
>         };
>@@ -4553,9 +4569,12 @@ void WebPageProxy::logFrameNavigation(co
> }
> #endif
> 
>-void WebPageProxy::decidePolicyForNavigationActionSync(uint64_t frameID, bool isMainFrame, WebCore::SecurityOriginData&& frameSecurityOrigin, uint64_t navigationID, NavigationActionData&& navigationActionData, FrameInfoData&& frameInfoData, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&& request, IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData& userData, Messages::WebPageProxy::DecidePolicyForNavigationActionSync::DelayedReply&& reply)
>+void WebPageProxy::decidePolicyForNavigationActionSync(uint64_t frameID, bool isMainFrame, WebCore::SecurityOriginData&& frameSecurityOrigin, PolicyCheckIdentifier identifier,
>+    uint64_t navigationID, NavigationActionData&& navigationActionData, FrameInfoData&& frameInfoData, uint64_t originatingPageID,
>+    const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&& request, IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse,
>+    const UserData& userData, Messages::WebPageProxy::DecidePolicyForNavigationActionSync::DelayedReply&& reply)
> {
>-    auto sender = PolicyDecisionSender::create(WTFMove(reply));
>+    auto sender = PolicyDecisionSender::create(identifier, WTFMove(reply));
> 
>     auto* frame = m_process->webFrame(frameID);
>     if (!frame) {
>@@ -4569,13 +4588,15 @@ void WebPageProxy::decidePolicyForNaviga
>         RELEASE_ASSERT(frame);
>     }
> 
>-    decidePolicyForNavigationAction(m_process.copyRef(), *frame, WTFMove(frameSecurityOrigin), navigationID, WTFMove(navigationActionData), WTFMove(frameInfoData), originatingPageID, originalRequest, WTFMove(request), WTFMove(requestBody), WTFMove(redirectResponse), userData, sender.copyRef());
>+    decidePolicyForNavigationAction(m_process.copyRef(), *frame, WTFMove(frameSecurityOrigin), navigationID, WTFMove(navigationActionData), WTFMove(frameInfoData),
>+        originatingPageID, originalRequest, WTFMove(request), WTFMove(requestBody), WTFMove(redirectResponse), userData, sender.copyRef());
> 
>     // If the client did not respond synchronously, proceed with the load.
>     sender->send(PolicyAction::Use, navigationID, DownloadID(), WTF::nullopt);
> }
> 
>-void WebPageProxy::decidePolicyForNewWindowAction(uint64_t frameID, const SecurityOriginData& frameSecurityOrigin, NavigationActionData&& navigationActionData, ResourceRequest&& request, const String& frameName, uint64_t listenerID, const UserData& userData)
>+void WebPageProxy::decidePolicyForNewWindowAction(uint64_t frameID, const SecurityOriginData& frameSecurityOrigin, PolicyCheckIdentifier identifier,
>+    NavigationActionData&& navigationActionData, ResourceRequest&& request, const String& frameName, uint64_t listenerID, const UserData& userData)
> {
>     PageClientProtector protector(pageClient());
> 
>@@ -4583,13 +4604,16 @@ void WebPageProxy::decidePolicyForNewWin
>     MESSAGE_CHECK(m_process, frame);
>     MESSAGE_CHECK_URL(m_process, request.url());
> 
>-    auto listener = makeRef(frame->setUpPolicyListenerProxy([this, protectedThis = makeRef(*this), listenerID, frameID] (PolicyAction policyAction, API::WebsitePolicies*, ProcessSwapRequestedByClient processSwapRequestedByClient, RefPtr<SafeBrowsingWarning>&& safeBrowsingWarning) mutable {
>+    auto listener = makeRef(frame->setUpPolicyListenerProxy([this, protectedThis = makeRef(*this), identifier, listenerID, frameID] (PolicyAction policyAction, API::WebsitePolicies*, ProcessSwapRequestedByClient processSwapRequestedByClient, RefPtr<SafeBrowsingWarning>&& safeBrowsingWarning) mutable {
>         // FIXME: Assert the API::WebsitePolicies* is nullptr here once clients of WKFramePolicyListenerUseWithPolicies go away.
>         RELEASE_ASSERT(processSwapRequestedByClient == ProcessSwapRequestedByClient::No);
>         ASSERT_UNUSED(safeBrowsingWarning, !safeBrowsingWarning);
>-        receivedPolicyDecision(policyAction, nullptr, WTF::nullopt, PolicyDecisionSender::create([this, protectedThis = WTFMove(protectedThis), frameID, listenerID] (auto... args) {
>+
>+        auto sender = PolicyDecisionSender::create(identifier, [this, protectedThis = WTFMove(protectedThis), frameID, listenerID] (auto... args) {
>             m_process->send(Messages::WebPage::DidReceivePolicyDecision(frameID, listenerID, args...), m_pageID);
>-        }));
>+        });
>+
>+        receivedPolicyDecision(policyAction, nullptr, WTF::nullopt, WTFMove(sender));
>     }, ShouldExpectSafeBrowsingResult::No));
> 
>     if (m_policyClient)
>@@ -4609,12 +4633,14 @@ void WebPageProxy::decidePolicyForNewWin
>         
> }
> 
>-void WebPageProxy::decidePolicyForResponse(uint64_t frameID, const SecurityOriginData& frameSecurityOrigin, uint64_t navigationID, const ResourceResponse& response, const ResourceRequest& request, bool canShowMIMEType, uint64_t listenerID, const UserData& userData)
>+void WebPageProxy::decidePolicyForResponse(uint64_t frameID, const SecurityOriginData& frameSecurityOrigin, PolicyCheckIdentifier identifier,
>+    uint64_t navigationID, const ResourceResponse& response, const ResourceRequest& request, bool canShowMIMEType, uint64_t listenerID, const UserData& userData)
> {
>-    decidePolicyForResponseShared(m_process.copyRef(), frameID, frameSecurityOrigin, navigationID, response, request, canShowMIMEType, listenerID, userData);
>+    decidePolicyForResponseShared(m_process.copyRef(), frameID, frameSecurityOrigin, identifier, navigationID, response, request, canShowMIMEType, listenerID, userData);
> }
> 
>-void WebPageProxy::decidePolicyForResponseShared(Ref<WebProcessProxy>&& process, uint64_t frameID, const SecurityOriginData& frameSecurityOrigin, uint64_t navigationID, const ResourceResponse& response, const ResourceRequest& request, bool canShowMIMEType, uint64_t listenerID, const UserData& userData)
>+void WebPageProxy::decidePolicyForResponseShared(Ref<WebProcessProxy>&& process, uint64_t frameID, const SecurityOriginData& frameSecurityOrigin, PolicyCheckIdentifier identifier,
>+    uint64_t navigationID, const ResourceResponse& response, const ResourceRequest& request, bool canShowMIMEType, uint64_t listenerID, const UserData& userData)
> {
>     PageClientProtector protector(pageClient());
> 
>@@ -4626,13 +4652,17 @@ void WebPageProxy::decidePolicyForRespon
>     MESSAGE_CHECK_URL(process, response.url());
> 
>     RefPtr<API::Navigation> navigation = navigationID ? m_navigationState->navigation(navigationID) : nullptr;
>-    auto listener = makeRef(frame->setUpPolicyListenerProxy([this, protectedThis = makeRef(*this), frameID, listenerID, navigation = WTFMove(navigation), process = process.copyRef()] (PolicyAction policyAction, API::WebsitePolicies*, ProcessSwapRequestedByClient processSwapRequestedByClient, RefPtr<SafeBrowsingWarning>&& safeBrowsingWarning) mutable {
>+    auto listener = makeRef(frame->setUpPolicyListenerProxy([this, protectedThis = makeRef(*this), frameID, identifier, listenerID, navigation = WTFMove(navigation),
>+        process = process.copyRef()] (PolicyAction policyAction, API::WebsitePolicies*, ProcessSwapRequestedByClient processSwapRequestedByClient, RefPtr<SafeBrowsingWarning>&& safeBrowsingWarning) mutable {
>         // FIXME: Assert the API::WebsitePolicies* is nullptr here once clients of WKFramePolicyListenerUseWithPolicies go away.
>         RELEASE_ASSERT(processSwapRequestedByClient == ProcessSwapRequestedByClient::No);
>         ASSERT_UNUSED(safeBrowsingWarning, !safeBrowsingWarning);
>-        receivedPolicyDecision(policyAction, navigation.get(), WTF::nullopt, PolicyDecisionSender::create([this, protectedThis = WTFMove(protectedThis), frameID, listenerID, process = WTFMove(process)] (auto... args) {
>+
>+        auto sender = PolicyDecisionSender::create(identifier, [this, protectedThis = WTFMove(protectedThis), frameID, listenerID, process = WTFMove(process)] (auto... args) {
>             process->send(Messages::WebPage::DidReceivePolicyDecision(frameID, listenerID, args...), m_pageID);
>-        }));
>+        });
>+        
>+        receivedPolicyDecision(policyAction, navigation.get(), WTF::nullopt, WTFMove(sender));
>     }, ShouldExpectSafeBrowsingResult::No));
> 
>     if (m_policyClient)
>Index: Source/WebKit/UIProcess/WebPageProxy.h
>===================================================================
>--- Source/WebKit/UIProcess/WebPageProxy.h	(revision 240901)
>+++ Source/WebKit/UIProcess/WebPageProxy.h	(working copy)
>@@ -1436,8 +1436,11 @@ public:
>     void didPerformClientRedirectShared(Ref<WebProcessProxy>&&, const String& sourceURLString, const String& destinationURLString, uint64_t frameID);
>     void didNavigateWithNavigationDataShared(Ref<WebProcessProxy>&&, const WebNavigationDataStore&, uint64_t frameID);
>     void didChangeProvisionalURLForFrameShared(Ref<WebProcessProxy>&&, uint64_t frameID, uint64_t navigationID, URL&&);
>-    void decidePolicyForNavigationActionAsyncShared(Ref<WebProcessProxy>&&, uint64_t frameID, WebCore::SecurityOriginData&& frameSecurityOrigin, uint64_t navigationID, NavigationActionData&&, FrameInfoData&&, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&&, IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData&, uint64_t listenerID);
>-    void decidePolicyForResponseShared(Ref<WebProcessProxy>&&, uint64_t frameID, const WebCore::SecurityOriginData& frameSecurityOrigin, uint64_t navigationID, const WebCore::ResourceResponse&, const WebCore::ResourceRequest&, bool canShowMIMEType, uint64_t listenerID, const UserData&);
>+    void decidePolicyForNavigationActionAsyncShared(Ref<WebProcessProxy>&&, uint64_t frameID, WebCore::SecurityOriginData&& frameSecurityOrigin, WebCore::PolicyCheckIdentifier,
>+        uint64_t navigationID, NavigationActionData&&, FrameInfoData&&, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&&,
>+        IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData&, uint64_t listenerID);
>+    void decidePolicyForResponseShared(Ref<WebProcessProxy>&&, uint64_t frameID, const WebCore::SecurityOriginData& frameSecurityOrigin, WebCore::PolicyCheckIdentifier,
>+        uint64_t navigationID, const WebCore::ResourceResponse&, const WebCore::ResourceRequest&, bool canShowMIMEType, uint64_t listenerID, const UserData&);
>     void startURLSchemeTaskShared(Ref<WebProcessProxy>&&, URLSchemeTaskParameters&&);
>     void loadDataWithNavigationShared(Ref<WebProcessProxy>&&, API::Navigation&, const IPC::DataReference&, const String& MIMEType, const String& encoding, const String& baseURL, API::Object* userData, WebCore::ShouldTreatAsContinuingLoad, Optional<WebsitePoliciesData>&& = WTF::nullopt);
>     void loadRequestWithNavigationShared(Ref<WebProcessProxy>&&, API::Navigation&, WebCore::ResourceRequest&&, WebCore::ShouldOpenExternalURLsPolicy, API::Object* userData, WebCore::ShouldTreatAsContinuingLoad, Optional<WebsitePoliciesData>&& = WTF::nullopt);
>@@ -1523,11 +1526,19 @@ private:
> 
>     void didDestroyNavigation(uint64_t navigationID);
> 
>-    void decidePolicyForNavigationAction(Ref<WebProcessProxy>&&, WebFrameProxy&, WebCore::SecurityOriginData&& frameSecurityOrigin, uint64_t navigationID, NavigationActionData&&, FrameInfoData&&, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&&, IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData&, Ref<PolicyDecisionSender>&&);
>-    void decidePolicyForNavigationActionAsync(uint64_t frameID, WebCore::SecurityOriginData&& frameSecurityOrigin, uint64_t navigationID, NavigationActionData&&, FrameInfoData&&, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&&, IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData&, uint64_t listenerID);
>-    void decidePolicyForNavigationActionSync(uint64_t frameID, bool isMainFrame, WebCore::SecurityOriginData&& frameSecurityOrigin, uint64_t navigationID, NavigationActionData&&, FrameInfoData&&, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&&, IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData&, Messages::WebPageProxy::DecidePolicyForNavigationActionSync::DelayedReply&&);
>-    void decidePolicyForNewWindowAction(uint64_t frameID, const WebCore::SecurityOriginData& frameSecurityOrigin, NavigationActionData&&, WebCore::ResourceRequest&&, const String& frameName, uint64_t listenerID, const UserData&);
>-    void decidePolicyForResponse(uint64_t frameID, const WebCore::SecurityOriginData& frameSecurityOrigin, uint64_t navigationID, const WebCore::ResourceResponse&, const WebCore::ResourceRequest&, bool canShowMIMEType, uint64_t listenerID, const UserData&);
>+    void decidePolicyForNavigationAction(Ref<WebProcessProxy>&&, WebFrameProxy&, WebCore::SecurityOriginData&&, uint64_t navigationID, NavigationActionData&&,
>+        FrameInfoData&&, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&&, IPC::FormDataReference&& requestBody,
>+        WebCore::ResourceResponse&& redirectResponse, const UserData&, Ref<PolicyDecisionSender>&&);
>+    void decidePolicyForNavigationActionAsync(uint64_t frameID, WebCore::SecurityOriginData&&, WebCore::PolicyCheckIdentifier, uint64_t navigationID, NavigationActionData&&,
>+        FrameInfoData&&, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&&, IPC::FormDataReference&& requestBody,
>+        WebCore::ResourceResponse&& redirectResponse, const UserData&, uint64_t listenerID);
>+    void decidePolicyForNavigationActionSync(uint64_t frameID, bool isMainFrame, WebCore::SecurityOriginData&&, WebCore::PolicyCheckIdentifier, uint64_t navigationID, NavigationActionData&&,
>+        FrameInfoData&&, uint64_t originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&&, IPC::FormDataReference&& requestBody,
>+        WebCore::ResourceResponse&& redirectResponse, const UserData&, Messages::WebPageProxy::DecidePolicyForNavigationActionSync::DelayedReply&&);
>+    void decidePolicyForNewWindowAction(uint64_t frameID, const WebCore::SecurityOriginData&, WebCore::PolicyCheckIdentifier, NavigationActionData&&,
>+        WebCore::ResourceRequest&&, const String& frameName, uint64_t listenerID, const UserData&);
>+    void decidePolicyForResponse(uint64_t frameID, const WebCore::SecurityOriginData&, WebCore::PolicyCheckIdentifier, uint64_t navigationID,
>+        const WebCore::ResourceResponse&, const WebCore::ResourceRequest&, bool canShowMIMEType, uint64_t listenerID, const UserData&);
>     void unableToImplementPolicy(uint64_t frameID, const WebCore::ResourceError&, const UserData&);
>     void beginSafeBrowsingCheck(const URL&, bool, WebFramePolicyListenerProxy&);
> 
>Index: Source/WebKit/UIProcess/WebPageProxy.messages.in
>===================================================================
>--- Source/WebKit/UIProcess/WebPageProxy.messages.in	(revision 240901)
>+++ Source/WebKit/UIProcess/WebPageProxy.messages.in	(working copy)
>@@ -105,10 +105,10 @@ messages -> WebPageProxy {
> #endif
> 
>     # Policy messages
>-    DecidePolicyForResponse(uint64_t frameID, struct WebCore::SecurityOriginData frameSecurityOrigin, uint64_t navigationID, WebCore::ResourceResponse response, WebCore::ResourceRequest request, bool canShowMIMEType, uint64_t listenerID, WebKit::UserData userData)
>-    DecidePolicyForNavigationActionAsync(uint64_t frameID, struct WebCore::SecurityOriginData frameSecurityOrigin, uint64_t navigationID, struct WebKit::NavigationActionData navigationActionData, struct WebKit::FrameInfoData originatingFrameInfoData, uint64_t originatingPageID, WebCore::ResourceRequest originalRequest, WebCore::ResourceRequest request, IPC::FormDataReference requestBody, WebCore::ResourceResponse redirectResponse, WebKit::UserData userData, uint64_t listenerID)
>-    DecidePolicyForNavigationActionSync(uint64_t frameID, bool isMainFrame, struct WebCore::SecurityOriginData frameSecurityOrigin, uint64_t navigationID, struct WebKit::NavigationActionData navigationActionData, struct WebKit::FrameInfoData originatingFrameInfoData, uint64_t originatingPageID, WebCore::ResourceRequest originalRequest, WebCore::ResourceRequest request, IPC::FormDataReference requestBody, WebCore::ResourceResponse redirectResponse, WebKit::UserData userData) -> (enum:uint8_t WebCore::PolicyAction policyAction, uint64_t newNavigationID, WebKit::DownloadID downloadID, Optional<WebKit::WebsitePoliciesData> websitePolicies) Delayed
>-    DecidePolicyForNewWindowAction(uint64_t frameID, struct WebCore::SecurityOriginData frameSecurityOrigin, struct WebKit::NavigationActionData navigationActionData, WebCore::ResourceRequest request, String frameName, uint64_t listenerID, WebKit::UserData userData)
>+    DecidePolicyForResponse(uint64_t frameID, struct WebCore::SecurityOriginData frameSecurityOrigin, WebCore::PolicyCheckIdentifier policyCheckIdentifier, uint64_t navigationID, WebCore::ResourceResponse response, WebCore::ResourceRequest request, bool canShowMIMEType, uint64_t listenerID, WebKit::UserData userData)
>+    DecidePolicyForNavigationActionAsync(uint64_t frameID, struct WebCore::SecurityOriginData frameSecurityOrigin, WebCore::PolicyCheckIdentifier policyCheckIdentifier, uint64_t navigationID, struct WebKit::NavigationActionData navigationActionData, struct WebKit::FrameInfoData originatingFrameInfoData, uint64_t originatingPageID, WebCore::ResourceRequest originalRequest, WebCore::ResourceRequest request, IPC::FormDataReference requestBody, WebCore::ResourceResponse redirectResponse, WebKit::UserData userData, uint64_t listenerID)
>+    DecidePolicyForNavigationActionSync(uint64_t frameID, bool isMainFrame, struct WebCore::SecurityOriginData frameSecurityOrigin, WebCore::PolicyCheckIdentifier policyCheckIdentifier, uint64_t navigationID, struct WebKit::NavigationActionData navigationActionData, struct WebKit::FrameInfoData originatingFrameInfoData, uint64_t originatingPageID, WebCore::ResourceRequest originalRequest, WebCore::ResourceRequest request, IPC::FormDataReference requestBody, WebCore::ResourceResponse redirectResponse, WebKit::UserData userData) -> (WebCore::PolicyCheckIdentifier policyCheckIdentifier, enum:uint8_t WebCore::PolicyAction policyAction, uint64_t newNavigationID, WebKit::DownloadID downloadID, Optional<WebKit::WebsitePoliciesData> websitePolicies) Delayed
>+    DecidePolicyForNewWindowAction(uint64_t frameID, struct WebCore::SecurityOriginData frameSecurityOrigin, WebCore::PolicyCheckIdentifier policyCheckIdentifier, struct WebKit::NavigationActionData navigationActionData, WebCore::ResourceRequest request, String frameName, uint64_t listenerID, WebKit::UserData userData)
>     UnableToImplementPolicy(uint64_t frameID, WebCore::ResourceError error, WebKit::UserData userData)
> 
>     # Progress messages
>Index: Source/WebKit/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp
>===================================================================
>--- Source/WebKit/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp	(revision 240901)
>+++ Source/WebKit/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp	(working copy)
>@@ -730,16 +730,16 @@ void WebFrameLoaderClient::dispatchShow(
>     webPage->show();
> }
> 
>-void WebFrameLoaderClient::dispatchDecidePolicyForResponse(const ResourceResponse& response, const ResourceRequest& request, FramePolicyFunction&& function)
>+void WebFrameLoaderClient::dispatchDecidePolicyForResponse(const ResourceResponse& response, const ResourceRequest& request, WebCore::PolicyCheckIdentifier identifier, FramePolicyFunction&& function)
> {
>     WebPage* webPage = m_frame ? m_frame->page() : nullptr;
>     if (!webPage) {
>-        function(PolicyAction::Ignore);
>+        function(PolicyAction::Ignore, identifier);
>         return;
>     }
> 
>     if (!request.url().string()) {
>-        function(PolicyAction::Use);
>+        function(PolicyAction::Use, identifier);
>         return;
>     }
> 
>@@ -748,7 +748,7 @@ void WebFrameLoaderClient::dispatchDecid
>     // Notify the bundle client.
>     WKBundlePagePolicyAction policy = webPage->injectedBundlePolicyClient().decidePolicyForResponse(webPage, m_frame, response, request, userData);
>     if (policy == WKBundlePagePolicyActionUse) {
>-        function(PolicyAction::Use);
>+        function(PolicyAction::Use, identifier);
>         return;
>     }
> 
>@@ -759,16 +759,18 @@ void WebFrameLoaderClient::dispatchDecid
>     auto navigationID = policyDocumentLoader ? static_cast<WebDocumentLoader&>(*policyDocumentLoader).navigationID() : 0;
>     
>     Ref<WebFrame> protector(*m_frame);
>-    uint64_t listenerID = m_frame->setUpPolicyListener(WTFMove(function), WebFrame::ForNavigationAction::No);
>-    if (!webPage->send(Messages::WebPageProxy::DecidePolicyForResponse(m_frame->frameID(), SecurityOriginData::fromFrame(coreFrame), navigationID, response, request, canShowResponse, listenerID, UserData(WebProcess::singleton().transformObjectsToHandles(userData.get()).get()))))
>-        m_frame->didReceivePolicyDecision(listenerID, PolicyAction::Ignore, 0, { }, { });
>+    uint64_t listenerID = m_frame->setUpPolicyListener(identifier, WTFMove(function), WebFrame::ForNavigationAction::No);
>+    if (!webPage->send(Messages::WebPageProxy::DecidePolicyForResponse(m_frame->frameID(), SecurityOriginData::fromFrame(coreFrame), identifier, navigationID, response, request,
>+        canShowResponse, listenerID, UserData(WebProcess::singleton().transformObjectsToHandles(userData.get()).get()))))
>+        m_frame->didReceivePolicyDecision(listenerID, identifier, PolicyAction::Ignore, 0, { }, { });
> }
> 
>-void WebFrameLoaderClient::dispatchDecidePolicyForNewWindowAction(const NavigationAction& navigationAction, const ResourceRequest& request, FormState* formState, const String& frameName, FramePolicyFunction&& function)
>+void WebFrameLoaderClient::dispatchDecidePolicyForNewWindowAction(const NavigationAction& navigationAction, const ResourceRequest& request,
>+    FormState* formState, const String& frameName, WebCore::PolicyCheckIdentifier identifier, FramePolicyFunction&& function)
> {
>     WebPage* webPage = m_frame ? m_frame->page() : nullptr;
>     if (!webPage) {
>-        function(PolicyAction::Ignore);
>+        function(PolicyAction::Ignore, identifier);
>         return;
>     }
> 
>@@ -779,11 +781,11 @@ void WebFrameLoaderClient::dispatchDecid
>     // Notify the bundle client.
>     WKBundlePagePolicyAction policy = webPage->injectedBundlePolicyClient().decidePolicyForNewWindowAction(webPage, m_frame, action.ptr(), request, frameName, userData);
>     if (policy == WKBundlePagePolicyActionUse) {
>-        function(PolicyAction::Use);
>+        function(PolicyAction::Use, identifier);
>         return;
>     }
> 
>-    uint64_t listenerID = m_frame->setUpPolicyListener(WTFMove(function), WebFrame::ForNavigationAction::No);
>+    uint64_t listenerID = m_frame->setUpPolicyListener(identifier, WTFMove(function), WebFrame::ForNavigationAction::No);
> 
>     NavigationActionData navigationActionData;
>     navigationActionData.navigationType = action->navigationType();
>@@ -797,7 +799,8 @@ void WebFrameLoaderClient::dispatchDecid
>     navigationActionData.downloadAttribute = navigationAction.downloadAttribute();
> 
>     WebCore::Frame* coreFrame = m_frame ? m_frame->coreFrame() : nullptr;
>-    webPage->send(Messages::WebPageProxy::DecidePolicyForNewWindowAction(m_frame->frameID(), SecurityOriginData::fromFrame(coreFrame), navigationActionData, request, frameName, listenerID, UserData(WebProcess::singleton().transformObjectsToHandles(userData.get()).get())));
>+    webPage->send(Messages::WebPageProxy::DecidePolicyForNewWindowAction(m_frame->frameID(), SecurityOriginData::fromFrame(coreFrame), identifier, navigationActionData, request,
>+        frameName, listenerID, UserData(WebProcess::singleton().transformObjectsToHandles(userData.get()).get())));
> }
> 
> void WebFrameLoaderClient::applyToDocumentLoader(WebsitePoliciesData&& websitePolicies)
>@@ -818,11 +821,12 @@ void WebFrameLoaderClient::applyToDocume
>     WebsitePoliciesData::applyToDocumentLoader(WTFMove(websitePolicies), *documentLoader);
> }
> 
>-void WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction(const NavigationAction& navigationAction, const ResourceRequest& request, const ResourceResponse& redirectResponse, FormState* formState, PolicyDecisionMode policyDecisionMode, FramePolicyFunction&& function)
>+void WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction(const NavigationAction& navigationAction, const ResourceRequest& request, const ResourceResponse& redirectResponse,
>+    FormState* formState, PolicyDecisionMode policyDecisionMode, WebCore::PolicyCheckIdentifier requestIdentifier, FramePolicyFunction&& function)
> {
>     WebPage* webPage = m_frame ? m_frame->page() : nullptr;
>     if (!webPage) {
>-        function(PolicyAction::Ignore);
>+        function(PolicyAction::Ignore, requestIdentifier);
>         return;
>     }
> 
>@@ -830,7 +834,7 @@ void WebFrameLoaderClient::dispatchDecid
> 
>     // Always ignore requests with empty URLs. 
>     if (request.isEmpty()) {
>-        function(PolicyAction::Ignore);
>+        function(PolicyAction::Ignore, requestIdentifier);
>         return;
>     }
> 
>@@ -841,11 +845,11 @@ void WebFrameLoaderClient::dispatchDecid
>     // Notify the bundle client.
>     WKBundlePagePolicyAction policy = webPage->injectedBundlePolicyClient().decidePolicyForNavigationAction(webPage, m_frame, action.ptr(), request, userData);
>     if (policy == WKBundlePagePolicyActionUse) {
>-        function(PolicyAction::Use);
>+        function(PolicyAction::Use, requestIdentifier);
>         return;
>     }
>-    
>-    uint64_t listenerID = m_frame->setUpPolicyListener(WTFMove(function), WebFrame::ForNavigationAction::Yes);
>+
>+    uint64_t listenerID = m_frame->setUpPolicyListener(requestIdentifier, WTFMove(function), WebFrame::ForNavigationAction::Yes);
> 
>     ASSERT(navigationAction.requester());
>     auto requester = navigationAction.requester().value();
>@@ -881,7 +885,7 @@ void WebFrameLoaderClient::dispatchDecid
> 
>     WebCore::Frame* coreFrame = m_frame->coreFrame();
>     if (!coreFrame)
>-        return function(PolicyAction::Ignore);
>+        return function(PolicyAction::Ignore, requestIdentifier);
>     WebDocumentLoader* documentLoader = static_cast<WebDocumentLoader*>(coreFrame->loader().policyDocumentLoader());
>     if (!documentLoader) {
>         // FIXME: When we receive a redirect after the navigation policy has been decided for the initial request,
>@@ -898,22 +902,28 @@ void WebFrameLoaderClient::dispatchDecid
> 
>     if (policyDecisionMode == PolicyDecisionMode::Synchronous) {
>         uint64_t newNavigationID;
>+        WebCore::PolicyCheckIdentifier responseIdentifier;
>         PolicyAction policyAction;
>         DownloadID downloadID;
>         Optional<WebsitePoliciesData> websitePolicies;
> 
>-        if (!webPage->sendSync(Messages::WebPageProxy::DecidePolicyForNavigationActionSync(m_frame->frameID(), m_frame->isMainFrame(), SecurityOriginData::fromFrame(coreFrame), documentLoader->navigationID(), navigationActionData, originatingFrameInfoData, originatingPageID, navigationAction.resourceRequest(), request, IPC::FormDataReference { request.httpBody() }, redirectResponse, UserData(WebProcess::singleton().transformObjectsToHandles(userData.get()).get())), Messages::WebPageProxy::DecidePolicyForNavigationActionSync::Reply(policyAction, newNavigationID, downloadID, websitePolicies))) {
>-            m_frame->didReceivePolicyDecision(listenerID, PolicyAction::Ignore, 0, { }, { });
>+        if (!webPage->sendSync(Messages::WebPageProxy::DecidePolicyForNavigationActionSync(m_frame->frameID(), m_frame->isMainFrame(), SecurityOriginData::fromFrame(coreFrame),
>+            requestIdentifier, documentLoader->navigationID(), navigationActionData, originatingFrameInfoData, originatingPageID, navigationAction.resourceRequest(), request,
>+            IPC::FormDataReference { request.httpBody() }, redirectResponse, UserData(WebProcess::singleton().transformObjectsToHandles(userData.get()).get())),
>+            Messages::WebPageProxy::DecidePolicyForNavigationActionSync::Reply(responseIdentifier, policyAction, newNavigationID, downloadID, websitePolicies))) {
>+            m_frame->didReceivePolicyDecision(listenerID, responseIdentifier, PolicyAction::Ignore, 0, { }, { });
>             return;
>         }
> 
>-        m_frame->didReceivePolicyDecision(listenerID, policyAction, 0, downloadID, { });
>+        m_frame->didReceivePolicyDecision(listenerID, responseIdentifier, policyAction, 0, downloadID, { });
>         return;
>     }
> 
>     ASSERT(policyDecisionMode == PolicyDecisionMode::Asynchronous);
>-    if (!webPage->send(Messages::WebPageProxy::DecidePolicyForNavigationActionAsync(m_frame->frameID(), SecurityOriginData::fromFrame(coreFrame), documentLoader->navigationID(), navigationActionData, originatingFrameInfoData, originatingPageID, navigationAction.resourceRequest(), request, IPC::FormDataReference { request.httpBody() }, redirectResponse, UserData(WebProcess::singleton().transformObjectsToHandles(userData.get()).get()), listenerID)))
>-        m_frame->didReceivePolicyDecision(listenerID, PolicyAction::Ignore, 0, { }, { });
>+    if (!webPage->send(Messages::WebPageProxy::DecidePolicyForNavigationActionAsync(m_frame->frameID(), SecurityOriginData::fromFrame(coreFrame),
>+        requestIdentifier, documentLoader->navigationID(), navigationActionData, originatingFrameInfoData, originatingPageID, navigationAction.resourceRequest(), request,
>+        IPC::FormDataReference { request.httpBody() }, redirectResponse, UserData(WebProcess::singleton().transformObjectsToHandles(userData.get()).get()), listenerID)))
>+        m_frame->didReceivePolicyDecision(listenerID, requestIdentifier, PolicyAction::Ignore, 0, { }, { });
> }
> 
> void WebFrameLoaderClient::cancelPolicyCheck()
>Index: Source/WebKit/WebProcess/WebCoreSupport/WebFrameLoaderClient.h
>===================================================================
>--- Source/WebKit/WebProcess/WebCoreSupport/WebFrameLoaderClient.h	(revision 240901)
>+++ Source/WebKit/WebProcess/WebCoreSupport/WebFrameLoaderClient.h	(working copy)
>@@ -123,9 +123,9 @@ private:
>     WebCore::Frame* dispatchCreatePage(const WebCore::NavigationAction&) final;
>     void dispatchShow() final;
>     
>-    void dispatchDecidePolicyForResponse(const WebCore::ResourceResponse&, const WebCore::ResourceRequest&, WebCore::FramePolicyFunction&&) final;
>-    void dispatchDecidePolicyForNewWindowAction(const WebCore::NavigationAction&, const WebCore::ResourceRequest&, WebCore::FormState*, const String& frameName, WebCore::FramePolicyFunction&&) final;
>-    void dispatchDecidePolicyForNavigationAction(const WebCore::NavigationAction&, const WebCore::ResourceRequest&, const WebCore::ResourceResponse& redirectResponse, WebCore::FormState*, WebCore::PolicyDecisionMode, WebCore::FramePolicyFunction&&) final;
>+    void dispatchDecidePolicyForResponse(const WebCore::ResourceResponse&, const WebCore::ResourceRequest&, WebCore::PolicyCheckIdentifier, WebCore::FramePolicyFunction&&) final;
>+    void dispatchDecidePolicyForNewWindowAction(const WebCore::NavigationAction&, const WebCore::ResourceRequest&, WebCore::FormState*, const String& frameName, WebCore::PolicyCheckIdentifier, WebCore::FramePolicyFunction&&) final;
>+    void dispatchDecidePolicyForNavigationAction(const WebCore::NavigationAction&, const WebCore::ResourceRequest&, const WebCore::ResourceResponse& redirectResponse, WebCore::FormState*, WebCore::PolicyDecisionMode, WebCore::PolicyCheckIdentifier, WebCore::FramePolicyFunction&&) final;
>     void cancelPolicyCheck() final;
>     
>     void dispatchUnableToImplementPolicy(const WebCore::ResourceError&) final;
>Index: Source/WebKit/WebProcess/WebPage/WebFrame.cpp
>===================================================================
>--- Source/WebKit/WebProcess/WebPage/WebFrame.cpp	(revision 240901)
>+++ Source/WebKit/WebProcess/WebPage/WebFrame.cpp	(working copy)
>@@ -210,12 +210,13 @@ void WebFrame::invalidate()
>     m_coreFrame = 0;
> }
> 
>-uint64_t WebFrame::setUpPolicyListener(WebCore::FramePolicyFunction&& policyFunction, ForNavigationAction forNavigationAction)
>+uint64_t WebFrame::setUpPolicyListener(WebCore::PolicyCheckIdentifier identifier, WebCore::FramePolicyFunction&& policyFunction, ForNavigationAction forNavigationAction)
> {
>     // FIXME: <rdar://5634381> We need to support multiple active policy listeners.
> 
>     invalidatePolicyListener();
> 
>+    m_policyIdentifier = identifier;
>     m_policyListenerID = generateListenerID();
>     m_policyFunction = WTFMove(policyFunction);
>     m_policyFunctionForNavigationAction = forNavigationAction;
>@@ -244,8 +245,10 @@ void WebFrame::invalidatePolicyListener(
> 
>     m_policyDownloadID = { };
>     m_policyListenerID = 0;
>+    auto identifier = m_policyIdentifier;
>+    m_policyIdentifier = WTF::nullopt;
>     if (auto function = std::exchange(m_policyFunction, nullptr))
>-        function(PolicyAction::Ignore);
>+        function(PolicyAction::Ignore, *identifier);
>     m_policyFunctionForNavigationAction = ForNavigationAction::No;
> 
>     auto willSubmitFormCompletionHandlers = WTFMove(m_willSubmitFormCompletionHandlers);
>@@ -253,11 +256,14 @@ void WebFrame::invalidatePolicyListener(
>         completionHandler();
> }
> 
>-void WebFrame::didReceivePolicyDecision(uint64_t listenerID, PolicyAction action, uint64_t navigationID, DownloadID downloadID, Optional<WebsitePoliciesData>&& websitePolicies)
>+void WebFrame::didReceivePolicyDecision(uint64_t listenerID, WebCore::PolicyCheckIdentifier identifier, PolicyAction action, uint64_t navigationID, DownloadID downloadID, Optional<WebsitePoliciesData>&& websitePolicies)
> {
>     if (!m_coreFrame || !m_policyListenerID || listenerID != m_policyListenerID || !m_policyFunction)
>         return;
> 
>+    ASSERT(identifier == m_policyIdentifier);
>+    m_policyIdentifier = WTF::nullopt;
>+
>     FramePolicyFunction function = WTFMove(m_policyFunction);
>     bool forNavigationAction = m_policyFunctionForNavigationAction == ForNavigationAction::Yes;
> 
>@@ -272,7 +278,7 @@ void WebFrame::didReceivePolicyDecision(
>             documentLoader->setNavigationID(navigationID);
>     }
> 
>-    function(action);
>+    function(action, identifier);
> }
> 
> void WebFrame::startDownload(const WebCore::ResourceRequest& request, const String& suggestedName)
>Index: Source/WebKit/WebProcess/WebPage/WebFrame.h
>===================================================================
>--- Source/WebKit/WebProcess/WebPage/WebFrame.h	(revision 240901)
>+++ Source/WebKit/WebProcess/WebPage/WebFrame.h	(working copy)
>@@ -83,9 +83,9 @@ public:
>     uint64_t frameID() const { return m_frameID; }
> 
>     enum class ForNavigationAction { No, Yes };
>-    uint64_t setUpPolicyListener(WebCore::FramePolicyFunction&&, ForNavigationAction);
>+    uint64_t setUpPolicyListener(WebCore::PolicyCheckIdentifier, WebCore::FramePolicyFunction&&, ForNavigationAction);
>     void invalidatePolicyListener();
>-    void didReceivePolicyDecision(uint64_t listenerID, WebCore::PolicyAction, uint64_t navigationID, DownloadID, Optional<WebsitePoliciesData>&&);
>+    void didReceivePolicyDecision(uint64_t listenerID, WebCore::PolicyCheckIdentifier, WebCore::PolicyAction, uint64_t navigationID, DownloadID, Optional<WebsitePoliciesData>&&);
> 
>     uint64_t setUpWillSubmitFormListener(CompletionHandler<void()>&&);
>     void continueWillSubmitForm(uint64_t);
>@@ -178,6 +178,7 @@ private:
>     WebCore::Frame* m_coreFrame { nullptr };
> 
>     uint64_t m_policyListenerID { 0 };
>+    Optional<WebCore::PolicyCheckIdentifier> m_policyIdentifier;
>     WebCore::FramePolicyFunction m_policyFunction;
>     ForNavigationAction m_policyFunctionForNavigationAction { ForNavigationAction::No };
>     HashMap<uint64_t, CompletionHandler<void()>> m_willSubmitFormCompletionHandlers;
>Index: Source/WebKit/WebProcess/WebPage/WebPage.cpp
>===================================================================
>--- Source/WebKit/WebProcess/WebPage/WebPage.cpp	(revision 240901)
>+++ Source/WebKit/WebProcess/WebPage/WebPage.cpp	(working copy)
>@@ -3078,12 +3078,12 @@ void WebPage::setSessionID(PAL::SessionI
>     m_page->setSessionID(sessionID);
> }
> 
>-void WebPage::didReceivePolicyDecision(uint64_t frameID, uint64_t listenerID, PolicyAction policyAction, uint64_t navigationID, const DownloadID& downloadID, Optional<WebsitePoliciesData>&& websitePolicies)
>+void WebPage::didReceivePolicyDecision(uint64_t frameID, uint64_t listenerID, PolicyCheckIdentifier identifier, PolicyAction policyAction, uint64_t navigationID, const DownloadID& downloadID, Optional<WebsitePoliciesData>&& websitePolicies)
> {
>     WebFrame* frame = WebProcess::singleton().webFrame(frameID);
>     if (!frame)
>         return;
>-    frame->didReceivePolicyDecision(listenerID, policyAction, navigationID, downloadID, WTFMove(websitePolicies));
>+    frame->didReceivePolicyDecision(listenerID, identifier, policyAction, navigationID, downloadID, WTFMove(websitePolicies));
> }
> 
> void WebPage::continueWillSubmitForm(uint64_t frameID, uint64_t listenerID)
>Index: Source/WebKit/WebProcess/WebPage/WebPage.h
>===================================================================
>--- Source/WebKit/WebProcess/WebPage/WebPage.h	(revision 240901)
>+++ Source/WebKit/WebProcess/WebPage/WebPage.h	(working copy)
>@@ -1314,7 +1314,7 @@ private:
>     bool parentProcessHasServiceWorkerEntitlement() const { return true; }
> #endif
> 
>-    void didReceivePolicyDecision(uint64_t frameID, uint64_t listenerID, WebCore::PolicyAction, uint64_t navigationID, const DownloadID&, Optional<WebsitePoliciesData>&&);
>+    void didReceivePolicyDecision(uint64_t frameID, uint64_t listenerID, WebCore::PolicyCheckIdentifier, WebCore::PolicyAction, uint64_t navigationID, const DownloadID&, Optional<WebsitePoliciesData>&&);
>     void continueWillSubmitForm(uint64_t frameID, uint64_t listenerID);
>     void setUserAgent(const String&);
>     void setCustomTextEncodingName(const String&);
>Index: Source/WebKit/WebProcess/WebPage/WebPage.messages.in
>===================================================================
>--- Source/WebKit/WebProcess/WebPage/WebPage.messages.in	(revision 240901)
>+++ Source/WebKit/WebProcess/WebPage/WebPage.messages.in	(working copy)
>@@ -171,7 +171,7 @@ messages -> WebPage LegacyReceiver {
>     DidRemoveBackForwardItem(struct WebCore::BackForwardItemIdentifier backForwardItemID)
> 
>     UpdateWebsitePolicies(struct WebKit::WebsitePoliciesData websitePolicies)
>-    DidReceivePolicyDecision(uint64_t frameID, uint64_t listenerID, enum:uint8_t WebCore::PolicyAction policyAction, uint64_t navigationID, WebKit::DownloadID downloadID, Optional<WebKit::WebsitePoliciesData> websitePolicies)
>+    DidReceivePolicyDecision(uint64_t frameID, uint64_t listenerID, WebCore::PolicyCheckIdentifier policyCheckIdentifier, enum:uint8_t WebCore::PolicyAction policyAction, uint64_t navigationID, WebKit::DownloadID downloadID, Optional<WebKit::WebsitePoliciesData> websitePolicies)
>     ContinueWillSubmitForm(uint64_t frameID, uint64_t listenerID)
> 
>     ClearSelection()
>Index: Source/WebKitLegacy/mac/ChangeLog
>===================================================================
>--- Source/WebKitLegacy/mac/ChangeLog	(revision 240901)
>+++ Source/WebKitLegacy/mac/ChangeLog	(working copy)
>@@ -1,3 +1,28 @@
>+2019-02-02  Ryosuke Niwa  <rniwa@webkit.org>
>+
>+        Validate navigation policy decisions to avoid crashes in continueLoadAfterNavigationPolicy
>+        https://bugs.webkit.org/show_bug.cgi?id=194189
>+
>+        Reviewed by Geoffrey Garen.
>+
>+        Pass the policy check identifier around functions and store it in WebFramePolicyListener
>+        so that we can send it back to WebCore with the navigation policy decision.
>+
>+        * WebCoreSupport/WebFrameLoaderClient.h:
>+        * WebCoreSupport/WebFrameLoaderClient.mm:
>+        (WebFrameLoaderClient::dispatchDecidePolicyForResponse):
>+        (WebFrameLoaderClient::dispatchDecidePolicyForNewWindowAction):
>+        (WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction):
>+        (WebFrameLoaderClient::dispatchWillSubmitForm):
>+        (WebFrameLoaderClient::setUpPolicyListener):
>+        (-[WebFramePolicyListener initWithFrame:identifier:policyFunction:defaultPolicy:]):
>+        (-[WebFramePolicyListener initWithFrame:identifier:policyFunction:defaultPolicy:appLinkURL:]):
>+        (-[WebFramePolicyListener invalidate]):
>+        (-[WebFramePolicyListener dealloc]):
>+        (-[WebFramePolicyListener receivedPolicyDecision:]):
>+        (-[WebFramePolicyListener initWithFrame:policyFunction:defaultPolicy:]): Deleted.
>+        (-[WebFramePolicyListener initWithFrame:policyFunction:defaultPolicy:appLinkURL:]): Deleted.
>+
> 2019-01-31  Alex Christensen  <achristensen@webkit.org>
> 
>         Revert r238819 which is unneeded and caused a performance regression.
>Index: Source/WebKitLegacy/mac/WebCoreSupport/WebFrameLoaderClient.h
>===================================================================
>--- Source/WebKitLegacy/mac/WebCoreSupport/WebFrameLoaderClient.h	(revision 240901)
>+++ Source/WebKitLegacy/mac/WebCoreSupport/WebFrameLoaderClient.h	(working copy)
>@@ -126,9 +126,9 @@ private:
>     WebCore::Frame* dispatchCreatePage(const WebCore::NavigationAction&) final;
>     void dispatchShow() final;
> 
>-    void dispatchDecidePolicyForResponse(const WebCore::ResourceResponse&, const WebCore::ResourceRequest&, WebCore::FramePolicyFunction&&) final;
>-    void dispatchDecidePolicyForNewWindowAction(const WebCore::NavigationAction&, const WebCore::ResourceRequest&, WebCore::FormState*, const WTF::String& frameName, WebCore::FramePolicyFunction&&) final;
>-    void dispatchDecidePolicyForNavigationAction(const WebCore::NavigationAction&, const WebCore::ResourceRequest&, const WebCore::ResourceResponse& redirectResponse, WebCore::FormState*, WebCore::PolicyDecisionMode, WebCore::FramePolicyFunction&&) final;
>+    void dispatchDecidePolicyForResponse(const WebCore::ResourceResponse&, const WebCore::ResourceRequest&, WebCore::PolicyCheckIdentifier, WebCore::FramePolicyFunction&&) final;
>+    void dispatchDecidePolicyForNewWindowAction(const WebCore::NavigationAction&, const WebCore::ResourceRequest&, WebCore::FormState*, const WTF::String& frameName, WebCore::PolicyCheckIdentifier, WebCore::FramePolicyFunction&&) final;
>+    void dispatchDecidePolicyForNavigationAction(const WebCore::NavigationAction&, const WebCore::ResourceRequest&, const WebCore::ResourceResponse& redirectResponse, WebCore::FormState*, WebCore::PolicyDecisionMode, WebCore::PolicyCheckIdentifier, WebCore::FramePolicyFunction&&) final;
>     void cancelPolicyCheck() final;
> 
>     void dispatchUnableToImplementPolicy(const WebCore::ResourceError&) final;
>@@ -233,7 +233,7 @@ private:
> 
>     RemoteAXObjectRef accessibilityRemoteObject() final { return 0; }
>     
>-    RetainPtr<WebFramePolicyListener> setUpPolicyListener(WebCore::FramePolicyFunction&&, WebCore::PolicyAction defaultPolicy, NSURL *appLinkURL = nil);
>+    RetainPtr<WebFramePolicyListener> setUpPolicyListener(WebCore::PolicyCheckIdentifier, WebCore::FramePolicyFunction&&, WebCore::PolicyAction defaultPolicy, NSURL *appLinkURL = nil);
> 
>     NSDictionary *actionDictionary(const WebCore::NavigationAction&, WebCore::FormState*) const;
>     
>Index: Source/WebKitLegacy/mac/WebCoreSupport/WebFrameLoaderClient.mm
>===================================================================
>--- Source/WebKitLegacy/mac/WebCoreSupport/WebFrameLoaderClient.mm	(revision 240901)
>+++ Source/WebKitLegacy/mac/WebCoreSupport/WebFrameLoaderClient.mm	(working copy)
>@@ -182,6 +182,7 @@ NSString *WebPluginContainerKey = @"WebP
> 
> @interface WebFramePolicyListener : NSObject <WebPolicyDecisionListener, WebFormSubmissionListener> {
>     RefPtr<Frame> _frame;
>+    PolicyCheckIdentifier _identifier;
>     FramePolicyFunction _policyFunction;
> #if HAVE(APP_LINKS)
>     RetainPtr<NSURL> _appLinkURL;
>@@ -189,9 +190,9 @@ @interface WebFramePolicyListener : NSOb
>     PolicyAction _defaultPolicy;
> }
> 
>-- (id)initWithFrame:(Frame*)frame policyFunction:(FramePolicyFunction&&)policyFunction defaultPolicy:(PolicyAction)defaultPolicy;
>+- (id)initWithFrame:(Frame*)frame identifier:(PolicyCheckIdentifier)identifier policyFunction:(FramePolicyFunction&&)policyFunction defaultPolicy:(PolicyAction)defaultPolicy;
> #if HAVE(APP_LINKS)
>-- (id)initWithFrame:(Frame*)frame policyFunction:(FramePolicyFunction&&)policyFunction defaultPolicy:(PolicyAction)defaultPolicy appLinkURL:(NSURL *)url;
>+- (id)initWithFrame:(Frame*)frame identifier:(PolicyCheckIdentifier)identifier policyFunction:(FramePolicyFunction&&)policyFunction defaultPolicy:(PolicyAction)defaultPolicy appLinkURL:(NSURL *)url;
> #endif
> 
> - (void)invalidate;
>@@ -865,7 +866,7 @@ void WebFrameLoaderClient::dispatchShow(
>     [[webView _UIDelegateForwarder] webViewShow:webView];
> }
> 
>-void WebFrameLoaderClient::dispatchDecidePolicyForResponse(const ResourceResponse& response, const ResourceRequest& request, FramePolicyFunction&& function)
>+void WebFrameLoaderClient::dispatchDecidePolicyForResponse(const ResourceResponse& response, const ResourceRequest& request, WebCore::PolicyCheckIdentifier identifier, FramePolicyFunction&& function)
> {
>     WebView *webView = getWebView(m_webFrame.get());
> 
>@@ -873,7 +874,7 @@ void WebFrameLoaderClient::dispatchDecid
>                         decidePolicyForMIMEType:response.mimeType()
>                                         request:request.nsURLRequest(HTTPBodyUpdatePolicy::UpdateHTTPBody)
>                                           frame:m_webFrame.get()
>-                               decisionListener:setUpPolicyListener(WTFMove(function), PolicyAction::Use).get()];
>+                               decisionListener:setUpPolicyListener(identifier, WTFMove(function), PolicyAction::Use).get()];
> }
> 
> 
>@@ -896,7 +897,7 @@ static BOOL shouldTryAppLink(WebView *we
> #endif
> }
> 
>-void WebFrameLoaderClient::dispatchDecidePolicyForNewWindowAction(const NavigationAction& action, const ResourceRequest& request, FormState* formState, const String& frameName, FramePolicyFunction&& function)
>+void WebFrameLoaderClient::dispatchDecidePolicyForNewWindowAction(const NavigationAction& action, const ResourceRequest& request, FormState* formState, const String& frameName, WebCore::PolicyCheckIdentifier identifier, FramePolicyFunction&& function)
> {
>     WebView *webView = getWebView(m_webFrame.get());
>     BOOL tryAppLink = shouldTryAppLink(webView, action, nullptr);
>@@ -905,10 +906,10 @@ void WebFrameLoaderClient::dispatchDecid
>             decidePolicyForNewWindowAction:actionDictionary(action, formState)
>                                    request:request.nsURLRequest(HTTPBodyUpdatePolicy::UpdateHTTPBody)
>                               newFrameName:frameName
>-                          decisionListener:setUpPolicyListener(WTFMove(function), PolicyAction::Ignore, tryAppLink ? (NSURL *)request.url() : nil).get()];
>+                          decisionListener:setUpPolicyListener(identifier, WTFMove(function), PolicyAction::Ignore, tryAppLink ? (NSURL *)request.url() : nil).get()];
> }
> 
>-void WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction(const NavigationAction& action, const ResourceRequest& request, const ResourceResponse&, FormState* formState, PolicyDecisionMode, FramePolicyFunction&& function)
>+void WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction(const NavigationAction& action, const ResourceRequest& request, const ResourceResponse&, FormState* formState, PolicyDecisionMode, WebCore::PolicyCheckIdentifier identifier, FramePolicyFunction&& function)
> {
>     WebView *webView = getWebView(m_webFrame.get());
>     BOOL tryAppLink = shouldTryAppLink(webView, action, core(m_webFrame.get()));
>@@ -917,7 +918,7 @@ void WebFrameLoaderClient::dispatchDecid
>                 decidePolicyForNavigationAction:actionDictionary(action, formState)
>                                         request:request.nsURLRequest(HTTPBodyUpdatePolicy::UpdateHTTPBody)
>                                           frame:m_webFrame.get()
>-                               decisionListener:setUpPolicyListener(WTFMove(function), PolicyAction::Ignore, tryAppLink ? (NSURL *)request.url() : nil).get()];
>+                               decisionListener:setUpPolicyListener(identifier, WTFMove(function), PolicyAction::Ignore, tryAppLink ? (NSURL *)request.url() : nil).get()];
> }
> 
> void WebFrameLoaderClient::cancelPolicyCheck()
>@@ -965,7 +966,9 @@ void WebFrameLoaderClient::dispatchWillS
>     }
> 
>     NSDictionary *values = makeFormFieldValuesDictionary(formState);
>-    CallFormDelegate(getWebView(m_webFrame.get()), @selector(frame:sourceFrame:willSubmitForm:withValues:submissionListener:), m_webFrame.get(), kit(formState.sourceDocument().frame()), kit(&formState.form()), values, setUpPolicyListener([completionHandler = WTFMove(completionHandler)](PolicyAction) mutable { completionHandler(); }, PolicyAction::Ignore).get());
>+    CallFormDelegate(getWebView(m_webFrame.get()), @selector(frame:sourceFrame:willSubmitForm:withValues:submissionListener:), m_webFrame.get(), kit(formState.sourceDocument().frame()), kit(&formState.form()), values, setUpPolicyListener(PolicyCheckIdentifier { },
>+        [completionHandler = WTFMove(completionHandler)](PolicyAction, PolicyCheckIdentifier) mutable { completionHandler(); },
>+        PolicyAction::Ignore).get());
> }
> 
> void WebFrameLoaderClient::revertToProvisionalState(DocumentLoader* loader)
>@@ -1518,7 +1521,7 @@ void WebFrameLoaderClient::dispatchDidBe
> {
> }
> 
>-RetainPtr<WebFramePolicyListener> WebFrameLoaderClient::setUpPolicyListener(FramePolicyFunction&& function, PolicyAction defaultPolicy, NSURL *appLinkURL)
>+RetainPtr<WebFramePolicyListener> WebFrameLoaderClient::setUpPolicyListener(PolicyCheckIdentifier identifier, FramePolicyFunction&& function, PolicyAction defaultPolicy, NSURL *appLinkURL)
> {
>     // FIXME: <rdar://5634381> We need to support multiple active policy listeners.
>     [m_policyListener invalidate];
>@@ -1526,10 +1529,10 @@ RetainPtr<WebFramePolicyListener> WebFra
>     RetainPtr<WebFramePolicyListener> policyListener;
> #if HAVE(APP_LINKS)
>     if (appLinkURL)
>-        policyListener = adoptNS([[WebFramePolicyListener alloc] initWithFrame:core(m_webFrame.get()) policyFunction:WTFMove(function) defaultPolicy:defaultPolicy appLinkURL:appLinkURL]);
>+        policyListener = adoptNS([[WebFramePolicyListener alloc] initWithFrame:core(m_webFrame.get()) identifier:identifier policyFunction:WTFMove(function) defaultPolicy:defaultPolicy appLinkURL:appLinkURL]);
>     else
> #endif
>-        policyListener = adoptNS([[WebFramePolicyListener alloc] initWithFrame:core(m_webFrame.get()) policyFunction:WTFMove(function) defaultPolicy:defaultPolicy]);
>+        policyListener = adoptNS([[WebFramePolicyListener alloc] initWithFrame:core(m_webFrame.get()) identifier:identifier policyFunction:WTFMove(function) defaultPolicy:defaultPolicy]);
> 
>     m_policyListener = policyListener.get();
> 
>@@ -2383,12 +2386,13 @@ + (void)initialize
> #endif
> }
> 
>-- (id)initWithFrame:(Frame*)frame policyFunction:(FramePolicyFunction&&)policyFunction defaultPolicy:(PolicyAction)defaultPolicy
>+- (id)initWithFrame:(Frame*)frame identifier:(PolicyCheckIdentifier)identifier policyFunction:(FramePolicyFunction&&)policyFunction defaultPolicy:(PolicyAction)defaultPolicy
> {
>     self = [self init];
>     if (!self)
>         return nil;
> 
>+    _identifier = identifier;
>     _frame = frame;
>     _policyFunction = WTFMove(policyFunction);
>     _defaultPolicy = defaultPolicy;
>@@ -2397,9 +2401,9 @@ - (id)initWithFrame:(Frame*)frame policy
> }
> 
> #if HAVE(APP_LINKS)
>-- (id)initWithFrame:(Frame*)frame policyFunction:(FramePolicyFunction&&)policyFunction defaultPolicy:(PolicyAction)defaultPolicy appLinkURL:(NSURL *)appLinkURL
>+- (id)initWithFrame:(Frame*)frame identifier:(PolicyCheckIdentifier)identifier policyFunction:(FramePolicyFunction&&)policyFunction defaultPolicy:(PolicyAction)defaultPolicy appLinkURL:(NSURL *)appLinkURL
> {
>-    self = [self initWithFrame:frame policyFunction:WTFMove(policyFunction) defaultPolicy:defaultPolicy];
>+    self = [self initWithFrame:frame identifier:identifier policyFunction:WTFMove(policyFunction) defaultPolicy:defaultPolicy];
>     if (!self)
>         return nil;
> 
>@@ -2413,7 +2417,7 @@ - (void)invalidate
> {
>     _frame = nullptr;
>     if (auto policyFunction = std::exchange(_policyFunction, nullptr))
>-        policyFunction(PolicyAction::Ignore);
>+        policyFunction(PolicyAction::Ignore, _identifier);
> }
> 
> - (void)dealloc
>@@ -2426,7 +2430,7 @@ - (void)dealloc
>     _frame = nullptr;
>     if (auto policyFunction = std::exchange(_policyFunction, nullptr)) {
>         RELEASE_LOG_ERROR(Loading, "Client application failed to make a policy decision via WebPolicyDecisionListener, using defaultPolicy %hhu", _defaultPolicy);
>-        policyFunction(_defaultPolicy);
>+        policyFunction(_defaultPolicy, _identifier);
>     }
> 
>     [super dealloc];
>@@ -2439,7 +2443,7 @@ - (void)receivedPolicyDecision:(PolicyAc
>         return;
> 
>     if (auto policyFunction = std::exchange(_policyFunction, nullptr))
>-        policyFunction(action);
>+        policyFunction(action, _identifier);
> }
> 
> - (void)ignore
>Index: Source/WebKitLegacy/win/ChangeLog
>===================================================================
>--- Source/WebKitLegacy/win/ChangeLog	(revision 240901)
>+++ Source/WebKitLegacy/win/ChangeLog	(working copy)
>@@ -1,3 +1,21 @@
>+2019-02-02  Ryosuke Niwa  <rniwa@webkit.org>
>+
>+        Validate navigation policy decisions to avoid crashes in continueLoadAfterNavigationPolicy
>+        https://bugs.webkit.org/show_bug.cgi?id=194189
>+
>+        Reviewed by Geoffrey Garen.
>+
>+        Pass the policy check identifier around functions and store it in WebFramePolicyListener
>+        so that we can send it back to WebCore with the navigation policy decision.
>+
>+        * WebCoreSupport/WebFrameLoaderClient.cpp:
>+        (WebFrameLoaderClient::dispatchDecidePolicyForResponse):
>+        (WebFrameLoaderClient::dispatchDecidePolicyForNewWindowAction):
>+        (WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction):
>+        (WebFrameLoaderClient::dispatchWillSubmitForm):
>+        (WebFrameLoaderClient::setUpPolicyListener):
>+        * WebCoreSupport/WebFrameLoaderClient.h:
>+
> 2019-01-31  Alex Christensen  <achristensen@webkit.org>
> 
>         Revert r238819 which is unneeded and caused a performance regression.
>Index: Source/WebKitLegacy/win/WebCoreSupport/WebFrameLoaderClient.cpp
>===================================================================
>--- Source/WebKitLegacy/win/WebCoreSupport/WebFrameLoaderClient.cpp	(revision 240901)
>+++ Source/WebKitLegacy/win/WebCoreSupport/WebFrameLoaderClient.cpp	(working copy)
>@@ -101,6 +101,7 @@ public:
> 
>     ~WebFramePolicyListenerPrivate() { }
> 
>+    PolicyCheckIdentifier m_policyCheckIdentifier;
>     FramePolicyFunction m_policyFunction;
>     COMPtr<WebFramePolicyListener> m_policyListener;
> };
>@@ -528,7 +529,7 @@ void WebFrameLoaderClient::dispatchShow(
>         ui->webViewShow(webView);
> }
> 
>-void WebFrameLoaderClient::dispatchDecidePolicyForResponse(const ResourceResponse& response, const ResourceRequest& request, FramePolicyFunction&& function)
>+void WebFrameLoaderClient::dispatchDecidePolicyForResponse(const ResourceResponse& response, const ResourceRequest& request, WebCore::PolicyCheckIdentifier identifier, FramePolicyFunction&& function)
> {
>     WebView* webView = m_webFrame->webView();
>     Frame* coreFrame = core(m_webFrame);
>@@ -540,13 +541,13 @@ void WebFrameLoaderClient::dispatchDecid
> 
>     COMPtr<IWebURLRequest> urlRequest(AdoptCOM, WebMutableURLRequest::createInstance(request));
> 
>-    if (SUCCEEDED(policyDelegate->decidePolicyForMIMEType(webView, BString(response.mimeType()), urlRequest.get(), m_webFrame, setUpPolicyListener(WTFMove(function)).get())))
>+    if (SUCCEEDED(policyDelegate->decidePolicyForMIMEType(webView, BString(response.mimeType()), urlRequest.get(), m_webFrame, setUpPolicyListener(identifier, WTFMove(function)).get())))
>         return;
> 
>-    m_policyListenerPrivate->m_policyFunction(PolicyAction::Use);
>+    m_policyListenerPrivate->m_policyFunction(PolicyAction::Use, identifier);
> }
> 
>-void WebFrameLoaderClient::dispatchDecidePolicyForNewWindowAction(const NavigationAction& action, const ResourceRequest& request, FormState* formState, const String& frameName, FramePolicyFunction&& function)
>+void WebFrameLoaderClient::dispatchDecidePolicyForNewWindowAction(const NavigationAction& action, const ResourceRequest& request, FormState* formState, const String& frameName, WebCore::PolicyCheckIdentifier identifier, FramePolicyFunction&& function)
> {
>     WebView* webView = m_webFrame->webView();
>     Frame* coreFrame = core(m_webFrame);
>@@ -559,13 +560,13 @@ void WebFrameLoaderClient::dispatchDecid
>     COMPtr<IWebURLRequest> urlRequest(AdoptCOM, WebMutableURLRequest::createInstance(request));
>     COMPtr<WebActionPropertyBag> actionInformation(AdoptCOM, WebActionPropertyBag::createInstance(action, formState ? &formState->form() : nullptr, coreFrame));
> 
>-    if (SUCCEEDED(policyDelegate->decidePolicyForNewWindowAction(webView, actionInformation.get(), urlRequest.get(), BString(frameName), setUpPolicyListener(WTFMove(function)).get())))
>+    if (SUCCEEDED(policyDelegate->decidePolicyForNewWindowAction(webView, actionInformation.get(), urlRequest.get(), BString(frameName), setUpPolicyListener(identifier, WTFMove(function)).get())))
>         return;
> 
>-    m_policyListenerPrivate->m_policyFunction(PolicyAction::Use);
>+    m_policyListenerPrivate->m_policyFunction(PolicyAction::Use, identifier);
> }
> 
>-void WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction(const NavigationAction& action, const ResourceRequest& request, const ResourceResponse&, FormState* formState, WebCore::PolicyDecisionMode, FramePolicyFunction&& function)
>+void WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction(const NavigationAction& action, const ResourceRequest& request, const ResourceResponse&, FormState* formState, WebCore::PolicyDecisionMode, WebCore::PolicyCheckIdentifier identifier, FramePolicyFunction&& function)
> {
>     WebView* webView = m_webFrame->webView();
>     Frame* coreFrame = core(m_webFrame);
>@@ -578,10 +579,10 @@ void WebFrameLoaderClient::dispatchDecid
>     COMPtr<IWebURLRequest> urlRequest(AdoptCOM, WebMutableURLRequest::createInstance(request));
>     COMPtr<WebActionPropertyBag> actionInformation(AdoptCOM, WebActionPropertyBag::createInstance(action, formState ? &formState->form() : nullptr, coreFrame));
> 
>-    if (SUCCEEDED(policyDelegate->decidePolicyForNavigationAction(webView, actionInformation.get(), urlRequest.get(), m_webFrame, setUpPolicyListener(WTFMove(function)).get())))
>+    if (SUCCEEDED(policyDelegate->decidePolicyForNavigationAction(webView, actionInformation.get(), urlRequest.get(), m_webFrame, setUpPolicyListener(identifier, WTFMove(function)).get())))
>         return;
> 
>-    m_policyListenerPrivate->m_policyFunction(PolicyAction::Use);
>+    m_policyListenerPrivate->m_policyFunction(PolicyAction::Use, identifier);
> }
> 
> void WebFrameLoaderClient::dispatchUnableToImplementPolicy(const ResourceError& error)
>@@ -623,7 +624,8 @@ void WebFrameLoaderClient::dispatchWillS
>     COMPtr<IPropertyBag> formValuesPropertyBag(AdoptCOM, COMPropertyBag<String>::createInstance(formValuesMap));
> 
>     COMPtr<WebFrame> sourceFrame(kit(formState.sourceDocument().frame()));
>-    if (SUCCEEDED(formDelegate->willSubmitForm(m_webFrame, sourceFrame.get(), formElement.get(), formValuesPropertyBag.get(), setUpPolicyListener([completionHandler = WTFMove(completionHandler)] (PolicyAction) mutable { completionHandler(); }).get())))
>+    if (SUCCEEDED(formDelegate->willSubmitForm(m_webFrame, sourceFrame.get(), formElement.get(), formValuesPropertyBag.get(),
>+        setUpPolicyListener(PolicyCheckIdentifier { }, [completionHandler = WTFMove(completionHandler)] (PolicyAction, PolicyCheckIdentifier) mutable { completionHandler(); }).get())))
>         return;
> 
>     // FIXME: Add a sane default implementation
>@@ -1282,7 +1284,7 @@ void WebFrameLoaderClient::cancelPolicyC
>     m_policyListenerPrivate->m_policyFunction = nullptr;
> }
> 
>-COMPtr<WebFramePolicyListener> WebFrameLoaderClient::setUpPolicyListener(WebCore::FramePolicyFunction&& function)
>+COMPtr<WebFramePolicyListener> WebFrameLoaderClient::setUpPolicyListener(WebCore::PolicyCheckIdentifier identifier, WebCore::FramePolicyFunction&& function)
> {
>     // FIXME: <rdar://5634381> We need to support multiple active policy listeners.
> 
>@@ -1293,6 +1295,7 @@ COMPtr<WebFramePolicyListener> WebFrameL
>     ASSERT(coreFrame);
> 
>     m_policyListenerPrivate->m_policyListener.adoptRef(WebFramePolicyListener::createInstance(coreFrame));
>+    m_policyListenerPrivate->m_policyCheckIdentifier = identifier;
>     m_policyListenerPrivate->m_policyFunction = WTFMove(function);
> 
>     return m_policyListenerPrivate->m_policyListener;
>@@ -1310,7 +1313,7 @@ void WebFrameLoaderClient::receivedPolic
>     Frame* coreFrame = core(m_webFrame);
>     ASSERT(coreFrame);
> 
>-    function(action);
>+    function(action, m_policyListenerPrivate->m_policyCheckIdentifier);
> }
> 
> void WebFrameLoaderClient::prefetchDNS(const String& hostname)
>Index: Source/WebKitLegacy/win/WebCoreSupport/WebFrameLoaderClient.h
>===================================================================
>--- Source/WebKitLegacy/win/WebCoreSupport/WebFrameLoaderClient.h	(revision 240901)
>+++ Source/WebKitLegacy/win/WebCoreSupport/WebFrameLoaderClient.h	(working copy)
>@@ -100,9 +100,9 @@ public:
>     void dispatchDidFinishLoad() override;
>     void dispatchDidReachLayoutMilestone(OptionSet<WebCore::LayoutMilestone>) override;
> 
>-    void dispatchDecidePolicyForResponse(const WebCore::ResourceResponse&, const WebCore::ResourceRequest&, WebCore::FramePolicyFunction&&) override;
>-    void dispatchDecidePolicyForNewWindowAction(const WebCore::NavigationAction&, const WebCore::ResourceRequest&, WebCore::FormState*, const WTF::String& frameName, WebCore::FramePolicyFunction&&) override;
>-    void dispatchDecidePolicyForNavigationAction(const WebCore::NavigationAction&, const WebCore::ResourceRequest&, const WebCore::ResourceResponse& redirectResponse, WebCore::FormState*, WebCore::PolicyDecisionMode, WebCore::FramePolicyFunction&&) override;
>+    void dispatchDecidePolicyForResponse(const WebCore::ResourceResponse&, const WebCore::ResourceRequest&, WebCore::PolicyCheckIdentifier, WebCore::FramePolicyFunction&&) override;
>+    void dispatchDecidePolicyForNewWindowAction(const WebCore::NavigationAction&, const WebCore::ResourceRequest&, WebCore::FormState*, const WTF::String& frameName, WebCore::PolicyCheckIdentifier, WebCore::FramePolicyFunction&&) override;
>+    void dispatchDecidePolicyForNavigationAction(const WebCore::NavigationAction&, const WebCore::ResourceRequest&, const WebCore::ResourceResponse& redirectResponse, WebCore::FormState*, WebCore::PolicyDecisionMode, WebCore::PolicyCheckIdentifier, WebCore::FramePolicyFunction&&) override;
>     void cancelPolicyCheck() override;
> 
>     void dispatchUnableToImplementPolicy(const WebCore::ResourceError&) override;
>@@ -197,7 +197,7 @@ public:
> 
>     void dispatchDidClearWindowObjectInWorld(WebCore::DOMWrapperWorld&) override;
> 
>-    COMPtr<WebFramePolicyListener> setUpPolicyListener(WebCore::FramePolicyFunction&&);
>+    COMPtr<WebFramePolicyListener> setUpPolicyListener(WebCore::PolicyCheckIdentifier, WebCore::FramePolicyFunction&&);
>     void receivedPolicyDecision(WebCore::PolicyAction);
> 
>     bool shouldAlwaysUsePluginDocument(const WTF::String& mimeType) const override;

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Attachments on bug 194189: 360967 | 360970 | 360993 | 360997 | 360998