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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [GTK+] Crash in WebCore::ImageFrame::ImageFrame()"
href="https://bugs.webkit.org/show_bug.cgi?id=170332#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [GTK+] Crash in WebCore::ImageFrame::ImageFrame()"
href="https://bugs.webkit.org/show_bug.cgi?id=170332">bug 170332</a>
from <span class="vcard"><a class="email" href="mailto:magomez@igalia.com" title="Miguel Gomez <magomez@igalia.com>"> <span class="fn">Miguel Gomez</span></a>
</span></b>
<pre>The problematic image is <a href="https://philip.html5.org/tests/apng/044.png">https://philip.html5.org/tests/apng/044.png</a>, which belongs to a test that checks for invalid images.
The rest reports 2 frames in its acTL segment, but then a single fdAT segment is found, meaning that there's only data from a single frame. ImageFrameCache::frameCount() initially reports 2 frames and ImageFrameCache::growFrames() is called to accomodate those 2 frames, but at some point ImageFrameCache::frameCount() starts returning 1 (I guess the decoder realizes there's no data for the second frame), and ImageFrameCache::growFrames() gets called again using a frameCount value smaller that the value it had, which causes the crash. There's an assertion ensuring that (m_frames.size() <= frameCount()) that gets triggered on debug mode warning about this.</pre>
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