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>

1 files changed, 3 insertions, 3 deletions

diff --git a/mm/slab.c b/mm/slab.c
index cd86f15071ad..324446621b3e 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3478,11 +3478,11 @@ free_done:
  * 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);