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Subject[PATCH 02/12] memcg: avoid accessing memcg after releasing reference
This might cause use-after-free bug.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
---
mm/memcontrol.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e054ac0..2364f4e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3192,12 +3192,12 @@ void memcg_release_cache(struct kmem_cache *s)

root = s->memcg_params->root_cache;
root->memcg_params->memcg_caches[id] = NULL;
- mem_cgroup_put(memcg);

mutex_lock(&memcg->slab_caches_mutex);
list_del(&s->memcg_params->list);
mutex_unlock(&memcg->slab_caches_mutex);

+ mem_cgroup_put(memcg);
out:
kfree(s->memcg_params);
}
--
1.8.0.2

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