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kasan: fix null pointer dereference in kasan_record_aux_stack
[linux-2.6-microblaze.git]
/
mm
/
kasan
/
generic.c
diff --git
a/mm/kasan/generic.c
b/mm/kasan/generic.c
index
1dd5a0f
..
5106b84
100644
(file)
--- a/
mm/kasan/generic.c
+++ b/
mm/kasan/generic.c
@@
-337,6
+337,8
@@
void kasan_record_aux_stack(void *addr)
cache = page->slab_cache;
object = nearest_obj(cache, page, addr);
alloc_meta = kasan_get_alloc_meta(cache, object);
cache = page->slab_cache;
object = nearest_obj(cache, page, addr);
alloc_meta = kasan_get_alloc_meta(cache, object);
+ if (!alloc_meta)
+ return;
alloc_meta->aux_stack[1] = alloc_meta->aux_stack[0];
alloc_meta->aux_stack[0] = kasan_save_stack(GFP_NOWAIT);
alloc_meta->aux_stack[1] = alloc_meta->aux_stack[0];
alloc_meta->aux_stack[0] = kasan_save_stack(GFP_NOWAIT);