<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp: PVS-Studio: CWE-476 (NULL Pointer Dereference)"
href="https://bugs.llvm.org/show_bug.cgi?id=32430">32430</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp: PVS-Studio: CWE-476 (NULL Pointer Dereference)
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</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>Common Code Generator Code
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>razmyslov@viva64.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>We have found a weakness 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: V595 The 'DIExpr' pointer was utilized before it was verified
against nullptr. Check lines: 949, 950. codeviewdebug.cpp 949
void CodeViewDebug::collectVariableInfo(const DISubprogram *SP) {
....
const DIExpression *DIExpr = DVInst->getDebugExpression();
bool IsSubfield = false;
unsigned StructOffset = 0;
// Handle fragments.
auto Fragment = DIExpr->getFragmentInfo(); // <=
if (DIExpr && Fragment) { // <=
IsSubfield = true;
StructOffset = Fragment->OffsetInBits / 8;
} else if (DIExpr && DIExpr->getNumElements() > 0) {
continue; // Ignore unrecognized exprs.
}
....
}</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>