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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - unix.MallocSizeof false positive"
href="https://bugs.llvm.org/show_bug.cgi?id=50214">50214</a>
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</tr>
<tr>
<th>Summary</th>
<td>unix.MallocSizeof false positive
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>11.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Static Analyzer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dcoughlin@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>orgads@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dcoughlin@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>test.c:
#include <stdlib.h>
struct Foo { int member; };
int main() {
void **foo = (void **)malloc(sizeof(struct Foo *));
free(foo);
}
$ scan-build gcc test.c
scan-build: Using '/usr/lib/llvm-11/bin/clang' for static analysis
test.c:6:25: warning: Result of 'malloc' is converted to a pointer of type
'void *', which is incompatible with sizeof operand type 'struct Foo *'
[unix.MallocSizeof]
void **foo = (void **)malloc(sizeof(struct Foo *));
~~~~~~~ ^~~~~~ ~~~~~~~~~~~~~~~~~~~~
sizeof is the same for all pointer types.</pre>
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