sl[au]b: always get the cache from its page in kmem_cache_free()

[mirror_ubuntu-zesty-kernel.git] / mm / slab.c

diff --git a/mm/slab.c b/mm/slab.c
index c26ab9fbe1f58cb32bf9f3c7a39f427afdb02482..bab6fec765a73db2a348f63ff9a1d683e7b0af69 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -87,7 +87,6 @@
  */
 
 #include       <linux/slab.h>
-#include       "slab.h"
 #include       <linux/mm.h>
 #include       <linux/poison.h>
 #include       <linux/swap.h>
@@ -128,6 +127,8 @@
 
 #include       "internal.h"
 
+#include       "slab.h"
+
 /*
  * DEBUG       - 1 for kmem_cache_create() to honour; SLAB_RED_ZONE & SLAB_POISON.
  *               0 for faster, smaller code (especially in the critical paths).
@@ -3883,6 +3884,9 @@ EXPORT_SYMBOL(__kmalloc);
 void kmem_cache_free(struct kmem_cache *cachep, void *objp)
 {
        unsigned long flags;
+       cachep = cache_from_obj(cachep, objp);
+       if (!cachep)
+               return;
 
        local_irq_save(flags);
        debug_check_no_locks_freed(objp, cachep->object_size);