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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 --- - scan-build: false positive w/memset return"
href="https://llvm.org/bugs/show_bug.cgi?id=25993">25993</a>
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<th>Summary</th>
<td>scan-build: false positive w/memset return
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<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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</tr>
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<th>Reporter</th>
<td>vapier@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>scan-build does not seem to understand the relationship between the first arg
and the return value. from POSIX:
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/memset.html">http://pubs.opengroup.org/onlinepubs/9699919799/functions/memset.html</a>
void *memset(void *s, int c, size_t n);
RETURN VALUE
The memset() function shall return s;
so when you have code like:
#include <stdio.h>
#include <string.h>
int main(int argc, char *argv[])
{
char *s = memset(malloc(10), 0, 10);
strcpy(s, "abc");
puts(s);
return 0;
}
scan-build wrongly reports:
test.c:5:2: warning: Potential memory leak
char *s = memset(malloc(10), 0, 10);
^~~~~~~
1 warning generated.
scan-build: 1 bug found.</pre>
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