kasan: don't use __builtin_return_address(1)
__builtin_return_address(1) is unreliable without frame pointers.
With defconfig on kmalloc_pagealloc_invalid_free test I am getting:
BUG: KASAN: double-free or invalid-free in (null)
Pass caller PC from callers explicitly.
Link: http://lkml.kernel.org/r/9b01bc2d237a4df74ff8472a3bf6b7635908de01.1514378558.git.dvyukov@google.com
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>a
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/slab.c b/mm/slab.c
index cd86f15..3244466 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3478,11 +3478,11 @@ static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac)
* Release an obj back to its cache. If the obj has a constructed state, it must
* be in this state _before_ it is released. Called with disabled ints.
*/
-static inline void __cache_free(struct kmem_cache *cachep, void *objp,
- unsigned long caller)
+static __always_inline void __cache_free(struct kmem_cache *cachep, void *objp,
+ unsigned long caller)
{
/* Put the object into the quarantine, don't touch it for now. */
- if (kasan_slab_free(cachep, objp))
+ if (kasan_slab_free(cachep, objp, _RET_IP_))
return;
___cache_free(cachep, objp, caller);
