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mm/slab_common.c: clear pointers to per memcg caches on destroy

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Currently, we do not clear pointers to per memcg caches in the
memcg_params.memcg_caches array when a global cache is destroyed with
kmem_cache_destroy.

This is fine if the global cache does get destroyed.  However, a cache can
be left on the list if it still has active objects when kmem_cache_destroy
is called (due to a memory leak).  If this happens, the entries in the
array will point to already freed areas, which is likely to result in data
corruption when the cache is reused (via slab merging).

Signed-off-by: Vladimir Davydov <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Vladimir Davydov 2015-11-05 18:45:11 -08:00 • committed by Linus Torvalds
commit d60fdcc9e3
2 changed files with 78 additions and 21 deletions
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6
mm/slab.h
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@ -181,10 +181,6 @@ bool __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **);
list_for_each_entry(iter, &(root)->memcg_params.list, \
memcg_params.list)
#define for_each_memcg_cache_safe(iter, tmp, root) \
list_for_each_entry_safe(iter, tmp, &(root)->memcg_params.list, \
memcg_params.list)
static inline bool is_root_cache(struct kmem_cache *s)
{
return s->memcg_params.is_root_cache;
@ -265,8 +261,6 @@ extern void slab_init_memcg_params(struct kmem_cache *);
#define for_each_memcg_cache(iter, root) \
for ((void)(iter), (void)(root); 0; )
#define for_each_memcg_cache_safe(iter, tmp, root) \
for ((void)(iter), (void)(tmp), (void)(root); 0; )
static inline bool is_root_cache(struct kmem_cache *s)
{