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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Dominator analysis does not handle NULL successors"
href="http://llvm.org/bugs/show_bug.cgi?id=16085">16085</a>
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<th>Summary</th>
<td>Dominator analysis does not handle NULL successors
</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>All
</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>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Static Analyzer
</td>
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<th>Assignee</th>
<td>kremenek@apple.com
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<th>Reporter</th>
<td>thomas.pani@gmail.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>CFGBuilder introduces NULL successors if the terminator condition can be
evaluated to a boolean value.
These NULL successors are unexpected / unhandled elsewhere, including:
- clang::DominatorTree::dump() [DT->getNode(*I) may evaluate to 0]
- llvm::DFSPass() [Succ may evaluate to 0]
E.g.
$ echo "int main() { return 0 ? 0 : 0; }" | clang -cc1 -analyze
-analyzer-checker=debug.DumpDominators -x c -
segfaults with a null ptr dereference.
PS: This could be unhandled in code other than the dominator analysis as well.</pre>
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