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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - False positive when checking pointers for NULL without using != NULL"
href="http://llvm.org/bugs/show_bug.cgi?id=15623">15623</a>
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<th>Summary</th>
<td>False positive when checking pointers for NULL without using != NULL
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</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>
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<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Static Analyzer
</td>
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<th>Assignee</th>
<td>kremenek@apple.com
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<th>Reporter</th>
<td>daniel@fahlgren.se
</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>Clang gives a false positive on the following example:
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
bool foo(void) {
char *param = malloc(10);
char *value = malloc(10);
bool ok = (param && value);
free(param);
free(value);
return ok;
}
test.c:11:4: warning: Use of memory after it is freed
return ok;
^ ~~
1 warning generated.
The warning is removed if the check is changed to:
bool ok = (param != NULL && value != NULL);</pre>
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