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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - false positive: Potential leak connected with memcpy"
href="https://llvm.org/bugs/show_bug.cgi?id=22954">22954</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>false positive: Potential leak connected with memcpy
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.6
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Static Analyzer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>kremenek@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>krzysztof.golinski@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Hello,
$ cat a.c
#include <string.h>
#include <stdlib.h>
struct aa {
char *s;
char data[123];
};
int main() {
struct aa a = {0};
a.s = strdup("hello");
char input[] = {'a', 'b', 'c', 'd'};
memcpy(a.data, input, 4);
free(a.s);
return 0;
}
This code snippet doesn't have memleak (tested with valgrind) but scan-build
complains about it.
Tested with gcc and clang and on both the output is the same:
scan-build clang a.c
scan-build: Using '/home/dirdival/clang-3.6/bin/clang' for static analysis
a.c:15:5: warning: Potential leak of memory pointed to by 'a.s'
free(a.s);
^~~~~~~~~
When I remove 2 lines everything works:
$ cat b.c
#include <string.h>
#include <stdlib.h>
struct aa {
char *s;
char data[123];
};
int main() {
struct aa a = {0};
a.s = strdup("hello");
free(a.s);
return 0;
}
$ scan-build clang b.c
scan-build: Using '/home/dirdival/clang-3.6/bin/clang' for static analysis
scan-build: Removing directory '/tmp/scan-build-2015-03-19-105501-3689-1'
because it contains no reports.
scan-build: No bugs found.
Additional information:
$ clang --version
clang version 3.6.0 (tags/RELEASE_360/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Regards,
Krzysztof</pre>
</div>
</p>
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