Messages in this thread Patch in this message | | | Date | Mon, 8 Apr 2013 14:33:19 +0800 | From | Li Zefan <> | Subject | [PATCH 02/12] memcg: avoid accessing memcg after releasing reference |
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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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