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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 - segfault which is triggered by integer overflow optimizations"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97598">97598</a>
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<th>Summary</th>
<td>segfault which is triggered by integer overflow optimizations
</td>
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<th>Product</th>
<td>poppler
</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
</td>
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<th>Component</th>
<td>general
</td>
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<th>Assignee</th>
<td>poppler-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>hanno@hboeck.de
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=126217" name="attach_126217" title="crash example (only with clang)">attachment 126217</a> <a href="attachment.cgi?id=126217&action=edit" title="crash example (only with clang)">[details]</a></span>
crash example (only with clang)
The attached file can segfault pdftops, but only when compiled with clang.
Test:
./configure CC=clang CXX=clang++; make; utils/pdftops [path_to_file]
This file triggers a signed integer overflow in FoFriTrueType.cc:
FoFiTrueType.cc:1362:26: runtime error: signed integer overflow: 1513436929 +
1846544308 cannot be represented in type 'int'
And also another bug earlier where a value too large for a certain type gets
assigned:
XRef.cc:1212:50: runtime error: load of value 3200171710, which is not a valid
value for type 'CryptAlgorithm'
(these two can be found by compiling with -fsanitize=undefined in
CFLAGS/CXXFLAGS/LDFLAGS - this also works with both clang/gcc)
This undefined behavior is very likely the reason for the different behaviors
of gcc and clang here. The compiler can optimize the code in a way that
"exploits" the fact that undefined behavior is not allowed to occur.</pre>
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