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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 --- - Multiple if / else if checks for NULL result in incorrect reporting of NULL dereference in final else"
href="https://llvm.org/bugs/show_bug.cgi?id=27674">27674</a>
</td>
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<tr>
<th>Summary</th>
<td>Multiple if / else if checks for NULL result in incorrect reporting of NULL dereference in final else
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>Macintosh
</td>
</tr>
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<th>OS</th>
<td>MacOS X
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Static Analyzer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>kremenek@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mark.rogers@powermapper.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ clang --version
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin14.5.0
Thread model: posix
Reproduction code:
class Buffer
{
void* m_pBuffer;
size_t m_size;
bool Equal( const Buffer& rhs)
{
if( !m_pBuffer && rhs.m_pBuffer )
{
// m_pBuffer is null
return false;
}
else if( m_pBuffer && !rhs.m_pBuffer )
{
// rhs.m_pBuffer is null
return false;
}
else
{
// neither argument is null but analyzer warns:
// Null pointer argument in call to memory comparison functions
int cmp = memcmp( m_pBuffer, rhs.m_pBuffer, std::min( m_size,
rhs.m_size ) );
return cmp == 0;
}
}
};</pre>
</div>
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