The code before the macro definition #undefs and redefines offsetof().
Unfortunately the new definition actually causes undefined behavior.
The code checks for __compiler_offsetof() before redefining. However
I'm not sure where it is supposed to be defined.
Just enclose the redefinition in #ifndef __GNUC__ for now.
Caught using clang -fsanitize=undefined.
Signed-off-by: Sami Liedes <sami.liedes@xxxxxx>
---
lib/ext2fs/rbtree.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/lib/ext2fs/rbtree.h b/lib/ext2fs/rbtree.h
index 16defb5..088c352 100644
--- a/lib/ext2fs/rbtree.h
+++ b/lib/ext2fs/rbtree.h
@@ -96,12 +96,14 @@ static inline struct page * rb_insert_page_cache(struct inode * inode,
#include <stdlib.h>
+#ifndef __GNUC__
#undef offsetof
#ifdef __compiler_offsetof
#define offsetof(TYPE,MEMBER) __compiler_offsetof(TYPE,MEMBER)
#else
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif
+#endif
#define container_of(ptr, type, member) ({ \
const __typeof__( ((type *)0)->member ) *__mptr = (ptr); \
--
1.7.10.4
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