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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
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<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - NULL pointer dereference : _clip_and_composite_boxes() tries to destroy __cairo_clip_all's path"
href="https://bugs.freedesktop.org/show_bug.cgi?id=77931">77931</a>
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</tr>
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<th>Assignee</th>
<td>psychon@znc.in
</td>
</tr>
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<th>Summary</th>
<td>NULL pointer dereference : _clip_and_composite_boxes() tries to destroy __cairo_clip_all's path
</td>
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<th>QA Contact</th>
<td>cairo-bugs@cairographics.org
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>All
</td>
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<th>Reporter</th>
<td>tetromino@gentoo.org
</td>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Version</th>
<td>1.12.16
</td>
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<th>Component</th>
<td>xcb backend
</td>
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<th>Product</th>
<td>cairo
</td>
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<pre>(As reported downstream at <a href="https://bugs.gentoo.org/show_bug.cgi?id=507478">https://bugs.gentoo.org/show_bug.cgi?id=507478</a>)
Gentoo users who tried linking firefox-28 with vanilla cairo-1.12.16 with the
xcb backend enabled (instead of using the patched cairo that's bundled with
firefox) have reported NULL pointer dereferences in _cairo_clip_path_destroy().
The crash is caused by _clip_and_composite_boxes() failing to check whether the
clip path being freed belongs to the constant __cairo_clip_all.</pre>
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