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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Detect buffer underflow"
href="https://bugs.llvm.org/show_bug.cgi?id=47130">47130</a>
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<th>Summary</th>
<td>Detect buffer underflow
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>11.0
</td>
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<th>Hardware</th>
<td>PC
</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>enhancement
</td>
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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>dcoughlin@apple.com
</td>
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<th>Reporter</th>
<td>orgads@gmail.com
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<th>CC</th>
<td>dcoughlin@apple.com, llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>It would be nice if Clang Analyzer detected buffer underflow.
For example:
#include <string.h>
typedef int BOOL;
#define ELEMENTS 20
BOOL array[ELEMENTS];
void foo()
{
memset(array,0, ELEMENTS); /* BOOL isn't 1 byte but 4 bytes long */
}
PVS-Studio detects this. See <a href="https://godbolt.org/z/hen3Kn">https://godbolt.org/z/hen3Kn</a>
Source:
<a href="https://stackoverflow.com/q/26102671/764870">https://stackoverflow.com/q/26102671/764870</a></pre>
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