memcg: avoid accessing memcg after releasing reference
This might cause a use-after-free bug. Signed-off-by: NLi Zefan <lizefan@huawei.com> Cc: Glauber Costa <glommer@parallels.com> Acked-by: NMichal Hocko <mhocko@suse.cz> Acked-by: NKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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