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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - false positive: use of memory after free"
href="http://llvm.org/bugs/show_bug.cgi?id=17812">17812</a>
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<th>Summary</th>
<td>false positive: use of memory after free
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</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>
</tr>
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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>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>reif@earthlink.net
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>I'm getting a false positive:
$ clang++ --analyze my_free.cpp
my_free.cpp:10:5: warning: Use of memory after it is freed
printf("leave my_free(%p)\n", memory);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
for this code:
#include <stdio.h>
#include <stdlib.h>
void my_free(void * memory)
{
printf("enter my_free(%p)\n", memory);
free(memory);
printf("leave my_free(%p)\n", memory);
}
int main()
{
char * m = (char *)malloc(10);
my_free(m);
}
It's printing the value of the pointer to freed memory but is is not
dereferencing the pointer.</pre>
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