https://bugs.llvm.org/show_bug.cgi?id=48236
Bug ID: 48236
Summary: dereferencing __attribute__((noderef)) should not warn
inside sizeof() expressions
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: ja...@google.com
Reporter: ja...@google.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
neeil...@live.com, richard-l...@metafoo.co.uk
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().
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