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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [static analyzer/ObjC] Static analyzer does not catch invoking a null block parameter"
href="https://bugs.llvm.org/show_bug.cgi?id=42398">42398</a>
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<th>Summary</th>
<td>[static analyzer/ObjC] Static analyzer does not catch invoking a null block parameter
</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>PC
</td>
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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>Static Analyzer
</td>
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<th>Assignee</th>
<td>dcoughlin@apple.com
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<th>Reporter</th>
<td>bhamiltoncx@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dcoughlin@apple.com, llvm-bugs@lists.llvm.org
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<pre>Created <span class=""><a href="attachment.cgi?id=22141" name="attach_22141" title="Repro for static analyzer bug">attachment 22141</a> <a href="attachment.cgi?id=22141&action=edit" title="Repro for static analyzer bug">[details]</a></span>
Repro for static analyzer bug
The Clang static analyzer correctly catches invoking a null block when it's a
local variable, but fails to catch the same issue when it's a nullable block
parameter:
% cat test.m
static void DoStuff(void (^_Nullable block_param)()) {
// This raises `core.CallAndMessage` as expected:
// warning: Called function pointer is null (null dereference)
[clang-analyzer-core.CallAndMessage]
void (^block)() = 0;
block();
// This should raise `nullability.NullableDereferenced` but does not
block_param();
// This raises neither `core.CallAndMessage` nor
`nullability.NullableDereferenced`
block_param = 0;
block_param();
}
% clang-tidy -checks=\* test.m -- -fblocks
1 warning generated.
test.m:5:3: warning: Called function pointer is null (null dereference)
[clang-analyzer-core.CallAndMessage]
block();
^
test.m:4:3: note: 'block' initialized to a null pointer value
void (^block)() = 0;
^
test.m:5:3: note: Called function pointer is null (null dereference)
block();
^</pre>
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