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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/213815">213815</a></dd>
<dt>Author</dt> <dd>carlosgc@webkit.org</dd>
<dt>Date</dt> <dd>2017-03-13 03:43:19 -0700 (Mon, 13 Mar 2017)</dd>
</dl>
<h3>Log Message</h3>
<pre>Merge <a href="http://trac.webkit.org/projects/webkit/changeset/213448">r213448</a> - [GTK] WebProcess from WebKitGtk+ 2.15.x SIGSEVs in GIFLZWContext::doLZW(unsigned char const*, unsigned long) at Source/WebCore/platform/image-decoders/gif/GIFImageReader.cpp:303
https://bugs.webkit.org/show_bug.cgi?id=167304
Reviewed by Carlos Garcia Campos.
Add a lock to ensure that the GIFImageReader that we are using for decoding is not deleted while
the decoding thread is using it.
No new tests.
* platform/image-decoders/gif/GIFImageDecoder.cpp:
(WebCore::GIFImageDecoder::clearFrameBufferCache):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#releasesWebKitGTKwebkit216SourceWebCoreChangeLog">releases/WebKitGTK/webkit-2.16/Source/WebCore/ChangeLog</a></li>
<li><a href="#releasesWebKitGTKwebkit216SourceWebCoreplatformimagedecodersgifGIFImageDecodercpp">releases/WebKitGTK/webkit-2.16/Source/WebCore/platform/image-decoders/gif/GIFImageDecoder.cpp</a></li>
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<h3>Diff</h3>
<a id="releasesWebKitGTKwebkit216SourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.16/Source/WebCore/ChangeLog (213814 => 213815)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.16/Source/WebCore/ChangeLog 2017-03-13 10:42:34 UTC (rev 213814)
+++ releases/WebKitGTK/webkit-2.16/Source/WebCore/ChangeLog 2017-03-13 10:43:19 UTC (rev 213815)
</span><span class="lines">@@ -1,3 +1,18 @@
</span><ins>+2017-03-06 Miguel Gomez <magomez@igalia.com>
+
+ [GTK] WebProcess from WebKitGtk+ 2.15.x SIGSEVs in GIFLZWContext::doLZW(unsigned char const*, unsigned long) at Source/WebCore/platform/image-decoders/gif/GIFImageReader.cpp:303
+ https://bugs.webkit.org/show_bug.cgi?id=167304
+
+ Reviewed by Carlos Garcia Campos.
+
+ Add a lock to ensure that the GIFImageReader that we are using for decoding is not deleted while
+ the decoding thread is using it.
+
+ No new tests.
+
+ * platform/image-decoders/gif/GIFImageDecoder.cpp:
+ (WebCore::GIFImageDecoder::clearFrameBufferCache):
+
</ins><span class="cx"> 2017-03-06 Vanessa Chipirrás Navalón <vchipirras@igalia.com>
</span><span class="cx">
</span><span class="cx"> [GStreamer] Adopt nullptr
</span></span></pre></div>
<a id="releasesWebKitGTKwebkit216SourceWebCoreplatformimagedecodersgifGIFImageDecodercpp"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.16/Source/WebCore/platform/image-decoders/gif/GIFImageDecoder.cpp (213814 => 213815)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.16/Source/WebCore/platform/image-decoders/gif/GIFImageDecoder.cpp 2017-03-13 10:42:34 UTC (rev 213814)
+++ releases/WebKitGTK/webkit-2.16/Source/WebCore/platform/image-decoders/gif/GIFImageDecoder.cpp 2017-03-13 10:43:19 UTC (rev 213815)
</span><span class="lines">@@ -133,6 +133,10 @@
</span><span class="cx"> if (m_frameBufferCache.isEmpty())
</span><span class="cx"> return; // Nothing to do.
</span><span class="cx">
</span><ins>+ // Lock the decodelock here, as we are going to destroy the GIFImageReader and doing so while
+ // there's an ongoing decode will cause a crash.
+ LockHolder locker(m_decodeLock);
+
</ins><span class="cx"> // The "-1" here is tricky. It does not mean that |clearBeforeFrame| is the
</span><span class="cx"> // last frame we wish to preserve, but rather that we never want to clear
</span><span class="cx"> // the very last frame in the cache: it's empty (so clearing it is
</span></span></pre>
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