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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - PVS-Studio: Use of Uninitialized Variable (CWE-457)"
href="https://bugs.llvm.org/show_bug.cgi?id=32249">32249</a>
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<th>Summary</th>
<td>PVS-Studio: Use of Uninitialized Variable (CWE-457)
</td>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>release blocker
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>DebugInfo
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>razmyslov@viva64.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18085" name="attach_18085" title="possible fix">attachment 18085</a> <a href="attachment.cgi?id=18085&action=edit" title="possible fix">[details]</a></span>
possible fix
We have found a vulnerability (CWE-457) using PVS-Studio tool: PVS-Studio is a
static code analyzer for C, C++ and C#: <a href="https://www.viva64.com/en/pvs-studio/">https://www.viva64.com/en/pvs-studio/</a>
Analyzer warning: V573 Uninitialized variable 'BytesToDrop' was used. The
variable was used to initialize itself.
static Error mapNameAndUniqueName(....) {
....
size_t BytesLeft = IO.maxFieldLength();
if (HasUniqueName) {
.....
if (BytesNeeded > BytesLeft) {
size_t BytesToDrop = (BytesNeeded - BytesLeft);
size_t DropN = std::min(N.size(), BytesToDrop / 2);
size_t DropU = std::min(U.size(), BytesToDrop - DropN);
....
}
} else {
size_t BytesNeeded = Name.size() + 1;
StringRef N = Name;
if (BytesNeeded > BytesLeft) {
size_t BytesToDrop = std::min(N.size(), BytesToDrop); // <=
N = N.drop_back(BytesToDrop);
}
error(IO.mapStringZ(N));
}
....
}</pre>
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