From 1383399d7be029281997889df23150fa6c16be6e Mon Sep 17 00:00:00 2001 From: Vladimir Davydov Date: Mon, 23 May 2016 16:22:29 -0700 Subject: [PATCH] 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 Acked-by: Michal Hocko Cc: Johannes Weiner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memcontrol.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index b3f16ab4b431..cf428d7b9a03 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1604,7 +1604,7 @@ static void memcg_oom_recover(struct mem_cgroup *memcg) static void mem_cgroup_oom(struct mem_cgroup *memcg, gfp_t mask, int order) { - if (!current->memcg_may_oom) + if (!current->memcg_may_oom || current->memcg_in_oom) return; /* * We are in the middle of the charge context here, so we