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);
+       if (!alloc_meta)
+               return;
 
        alloc_meta->aux_stack[1] = alloc_meta->aux_stack[0];
        alloc_meta->aux_stack[0] = kasan_save_stack(GFP_NOWAIT);