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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - analyzer reports use after free with fprintf is printing a variable address"
href="https://llvm.org/bugs/show_bug.cgi?id=25568">25568</a>
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<th>Summary</th>
<td>analyzer reports use after free with fprintf is printing a variable address
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.7
</td>
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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>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Static Analyzer
</td>
</tr>
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<th>Assignee</th>
<td>kremenek@apple.com
</td>
</tr>
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<th>Reporter</th>
<td>cliffyapp@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>When provided the line:
fprintf(stderr, "%p realloc%6d %s [moved from %p]\n",
ptr, (int)siz, str, original_ptr);
clang reports a use of freed memory printing original_ptr. It is true the
memory pointed to by the address stored in original_ptr has been freed, but in
this case we aren't trying to access that memory but instead print the address
at which it was located. This appears to be a false positive, albeit one which
needs to be aware of how fprintf is using original_ptr.</pre>
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</p>
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