Commit fd0ccaf2 authored by Li Zefan's avatar Li Zefan Committed by Linus Torvalds

memcg: avoid accessing memcg after releasing reference

This might cause a use-after-free bug.
Signed-off-by: default avatarLi Zefan <lizefan@huawei.com>
Cc: Glauber Costa <glommer@parallels.com>
Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
Acked-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 865ffef3
...@@ -3215,12 +3215,12 @@ void memcg_release_cache(struct kmem_cache *s) ...@@ -3215,12 +3215,12 @@ void memcg_release_cache(struct kmem_cache *s)
root = s->memcg_params->root_cache; root = s->memcg_params->root_cache;
root->memcg_params->memcg_caches[id] = NULL; root->memcg_params->memcg_caches[id] = NULL;
mem_cgroup_put(memcg);
mutex_lock(&memcg->slab_caches_mutex); mutex_lock(&memcg->slab_caches_mutex);
list_del(&s->memcg_params->list); list_del(&s->memcg_params->list);
mutex_unlock(&memcg->slab_caches_mutex); mutex_unlock(&memcg->slab_caches_mutex);
mem_cgroup_put(memcg);
out: out:
kfree(s->memcg_params); kfree(s->memcg_params);
} }
......
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