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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ArrayBoundCheckerV2 false positive if indexer has size_t type"
href="https://bugs.llvm.org/show_bug.cgi?id=45148">45148</a>
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<th>Summary</th>
<td>ArrayBoundCheckerV2 false positive if indexer has size_t type
</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>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Static Analyzer
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<th>Assignee</th>
<td>dcoughlin@apple.com
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<th>Reporter</th>
<td>benicsbalazs@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dcoughlin@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23216" name="attach_23216" title="Rewritten exploded graphs of all three functions of the example.">attachment 23216</a> <a href="attachment.cgi?id=23216&action=edit" title="Rewritten exploded graphs of all three functions of the example.">[details]</a></span>
Rewritten exploded graphs of all three functions of the example.
This bug was reported by Loïc Joly.
You can read the original discussion at the cfe-dev archives:
<a href="http://lists.llvm.org/pipermail/cfe-dev/2020-March/064783.html">http://lists.llvm.org/pipermail/cfe-dev/2020-March/064783.html</a>
The gist of this bug is demonstrated by this example:
```
// clang -cc1 -analyze -analyzer-checker=core,alpha.security.ArrayBoundV2
arrayv2.c
typedef unsigned long long size_t;
const char a[] = "aabbcc";
char f1(size_t len) {
return a[len+1];
// ^~~~~~~~
// arrayv2.c:7:10: warning: Out of bound memory access (access exceeds upper
limit of memory block)
}
char f2(size_t len) {
return a[len]; // no-warning
}
char f3(int len) {
return a[len+1]; // no-warning
}
```</pre>
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