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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - leak in __cxa_demangle"
href="https://llvm.org/bugs/show_bug.cgi?id=31030">31030</a>
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<th>Summary</th>
<td>leak in __cxa_demangle
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>kcc@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>on fresh trunk: feed these 8 bytes into __cxa_demangle to get a memory leak:
00000000: 5f5a 355a 835a 8340 _Z5Z.Z.@
full reproducer:
#include <stddef.h>
extern "C" char *
__cxa_demangle(const char *mangled_name, char *buf, size_t *n, int *status);
int main() {
unsigned char buf[] = {0x5f, 0x5a, 0x35, 0x5a, 0x83, 0x5a, 0x83, 0x40, 0};
__cxa_demangle((char*)buf, 0, 0, 0);
}
cc llvm/projects/libcxxabi/src
clang++ -std=c++11 -g cxa_demangle.cpp -I../include repro.cc -o repro
-fsanitize=address
==20050==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 6 byte(s) in 1 object(s) allocated from:
#0 0x4c1fce in realloc
#1 0x4f0c33 in __cxa_demangle
llvm/projects/libcxxabi/src/cxa_demangle.cpp:5023:47
(found by libFuzzer, see also
<a href="https://bugs.chromium.org/p/chromium/issues/detail?id=606626">https://bugs.chromium.org/p/chromium/issues/detail?id=606626</a>)</pre>
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