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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Image compositor can pass invalid coordinates to pixman_fill()"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90120">90120</a>
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<th>Summary</th>
<td>Image compositor can pass invalid coordinates to pixman_fill()
</td>
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<th>Product</th>
<td>cairo
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>general
</td>
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
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<th>Reporter</th>
<td>federico@gnome.org
</td>
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<th>QA Contact</th>
<td>cairo-bugs@cairographics.org
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<div>
<pre>See <a href="https://bugzilla.gnome.org/show_bug.cgi?id=744391">https://bugzilla.gnome.org/show_bug.cgi?id=744391</a> for where this comes
from.
Summary: librsvg gets an SVG generated through fuzz-testing, and passes big
coordinates that give problems to Cairo. In turn, Cairo ends up passing
invalid coordinates to pixman_fill(), which does an out-of-bounds write.
Pixman doesn't validate the arguments passed to pixman_fill().
Given that Cairo's problems with big coordinates and fixed-point overflow are
Hard To Fix(tm), we can make Cairo at least responsible for not passing invalid
coordinates to pixman's low-level machinery.
The attached patch takes care of the call to pixman_fill() from this particular
code path. I haven't gotten reports of other invalid calls to pixman_fill()
from Cairo/librsvg.</pre>
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