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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - UBSan: missing check for modifying a const object through a const_cast"
href="https://llvm.org/bugs/show_bug.cgi?id=25886">25886</a>
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<th>Summary</th>
<td>UBSan: missing check for modifying a const object through a const_cast
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>gonzalobg88@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>The following UB is not currently caught by UBSan:
struct A {
const int b = 10;
};
int main() {
const int c = 25;
const_cast<int&>(c) = 20; // UB
A a;
const_cast<int&>(a.b) = c; // UB
return a.b;
}
This is UB per [dcl.type.cv]/4.</pre>
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