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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - cairo 1.14.12 hangs in read_png called from cairo_image_surface_create_from_png_stream on malformed png"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104325">104325</a>
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<th>Summary</th>
<td>cairo 1.14.12 hangs in read_png called from cairo_image_surface_create_from_png_stream on malformed png
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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
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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>critical
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>png functions
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<th>Assignee</th>
<td>cworth@cworth.org
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<th>Reporter</th>
<td>orivej@gmx.fr
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<th>QA Contact</th>
<td>cairo-bugs@cairographics.org
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<p>
<div>
<pre>This is a regression since cairo 1.14.10 revealed by cairocffi tests.
With a PNG file truncated to 30 bytes [1], cairo 1.4.12 hangs on CPU in
read_png(), infinitely calling png_get_IHDR() and never reaching this line:
<a href="https://cgit.freedesktop.org/cairo/tree/src/cairo-png.c?h=1.14&id=d53db01d01a48c48a1633a8d531f979a99d316bd#n591">https://cgit.freedesktop.org/cairo/tree/src/cairo-png.c?h=1.14&id=d53db01d01a48c48a1633a8d531f979a99d316bd#n591</a>
The bug was introduced in
<a href="https://cgit.freedesktop.org/cairo/commit/?h=1.14&id=d53db01d01a48c48a1633a8d531f979a99d316bd">https://cgit.freedesktop.org/cairo/commit/?h=1.14&id=d53db01d01a48c48a1633a8d531f979a99d316bd</a>
To reproduce, run cairocffi tests against cairo on Linux.
Discovered at
<a href="https://github.com/NixOS/nixpkgs/commit/fc5756ea5e4a73624e0cfbb0e3eef247fc312547">https://github.com/NixOS/nixpkgs/commit/fc5756ea5e4a73624e0cfbb0e3eef247fc312547</a>
[1]
<a href="https://github.com/Kozea/cairocffi/blob/9cba2e6039869db6710a5fb6a1af0f139509fc00/cairocffi/test_cairo.py#L253">https://github.com/Kozea/cairocffi/blob/9cba2e6039869db6710a5fb6a1af0f139509fc00/cairocffi/test_cairo.py#L253</a></pre>
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</p>
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