mm: memcontrol: fix possible css ref leak on oom
authorVladimir Davydov <vdavydov@virtuozzo.com>
Mon, 23 May 2016 23:22:29 +0000 (16:22 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 24 May 2016 00:04:14 +0000 (17:04 -0700)
commit1383399d7be029281997889df23150fa6c16be6e
tree9cdc21abe7297912673a4d540b50d45c932603f6
parentf43edca7ed08fc02279f2a62015da5cb6aa0ad61
mm: memcontrol: fix possible css ref leak on oom

mem_cgroup_oom may be invoked multiple times while a process is handling
a page fault, in which case current->memcg_in_oom will be overwritten
leaking the previously taken css reference.

Link: http://lkml.kernel.org/r/1464019330-7579-1-git-send-email-vdavydov@virtuozzo.com
Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/memcontrol.c