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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - dereferencing __attribute__((noderef)) should not warn inside sizeof() expressions"
href="https://bugs.llvm.org/show_bug.cgi?id=48236">48236</a>
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<th>Summary</th>
<td>dereferencing __attribute__((noderef)) should not warn inside sizeof() expressions
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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>Linux
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<th>Status</th>
<td>NEW
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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>-New Bugs
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<th>Assignee</th>
<td>jannh@google.com
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<th>Reporter</th>
<td>jannh@google.com
</td>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>The purpose of __attribute__((noderef)) is to warn about code that will cause
memory to be dereferenced. Currently, clang also warns about code such as:
```
void copy_from_user(void *dst, void __attribute__((noderef)) *src, unsigned
long len);
struct foo {
int a;
int b;
};
int test_false_positive_deref(struct foo __attribute__((noderef)) *user_foo) {
struct foo local_foo;
copy_from_user(&local_foo, user_foo, sizeof(*user_foo));
return local_foo.a + local_foo.b;
}
```
noderef checks should be suppressed if isUnevaluatedContext().</pre>
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