Attachment 346812 Details for Bug 188429 – Patch

[patch] Patch

bug-188429-20180808195038.patch (text/plain), 2.51 KB, created by Justin Fan on 2018-08-08 19:50:39 PDT

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Creator: Justin Fan

Created: 2018-08-08 19:50:39 PDT

Size: 2.51 KB

patch

obsolete

>Subversion Revision: 234659
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index ec38d74d5e8ffb0b4428d55ad0a2e572adf60074..32dc58203d29e0a4d1ef71b96875f10e3a38595b 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,18 @@
>+2018-08-08  Justin Fan  <justin_fan@apple.com>
>+
>+        Prevent collectScreenProperties from crashing Base System
>+        https://bugs.webkit.org/show_bug.cgi?id=188429
>+        <rdar://problem/43075662>
>+
>+        Adding some error-checking and early returns to further prevent calling CGLDescribeRenderer with invalid parameters.
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Existing WebGL tests should cover; no expected change in behavior. Crash happened primarily on Base System. 
>+
>+        * platform/mac/PlatformScreenMac.mm:
>+        (WebCore::gpuIDForDisplayMask):
>+
> 2018-08-07  Ryan Haddad  <ryanhaddad@apple.com>
> 
>         Unreviewed, suppress warnings to fix the build.
>diff --git a/Source/WebCore/platform/mac/PlatformScreenMac.mm b/Source/WebCore/platform/mac/PlatformScreenMac.mm
>index e78434f31e5b583fd5f0fc91527779704b8da5ff..4f0b7257e7e63a463a9ed313606e0d4f78964988 100644
>--- a/Source/WebCore/platform/mac/PlatformScreenMac.mm
>+++ b/Source/WebCore/platform/mac/PlatformScreenMac.mm
>@@ -199,24 +199,33 @@ IORegistryGPUID gpuIDForDisplay(PlatformDisplayID displayID)
> 
> IORegistryGPUID gpuIDForDisplayMask(GLuint displayMask)
> {
>-    GLint numRenderers;
>-    CGLRendererInfoObj rendererInfo;
>+    GLint numRenderers = 0;
>+    CGLRendererInfoObj rendererInfo = 0;
>     CGLError error = CGLQueryRendererInfo(displayMask, &rendererInfo, &numRenderers);
>     ASSERT(error == kCGLNoError);
>+    if (!numRenderers || !rendererInfo || error != kCGLNoError)
>+        return 0;
> 
>     // The 0th renderer should not be the software renderer.
>     GLint isAccelerated;
>     error = CGLDescribeRenderer(rendererInfo, 0, kCGLRPAccelerated, &isAccelerated);
>     ASSERT(error == kCGLNoError);
>     ASSERT(isAccelerated);
>+    if (!isAccelerated || error != kCGLNoError)
>+        return 0;
> 
>-    GLint gpuIDLow;
>-    GLint gpuIDHigh;
>+    GLint gpuIDLow = 0;
>+    GLint gpuIDHigh = 0;
> 
>     error = CGLDescribeRenderer(rendererInfo, 0, kCGLRPRegistryIDLow, &gpuIDLow);
>     ASSERT(error == kCGLNoError);
>+    if (error != kCGLNoError)
>+        return 0;
>+
>     error = CGLDescribeRenderer(rendererInfo, 0, kCGLRPRegistryIDHigh, &gpuIDHigh);
>     ASSERT(error == kCGLNoError);
>+    if (error != kCGLNoError)
>+        return 0;
> 
>     return (IORegistryGPUID) gpuIDHigh << 32 | gpuIDLow;
> }

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