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mm: memcontrol: fix possible css ref leak on oom

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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/[email protected]
Signed-off-by: Vladimir Davydov <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: Johannes Weiner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Vladimir Davydov 2016-05-23 16:22:29 -07:00 • committed by Linus Torvalds
commit 1383399d7b
1 changed files with 1 additions and 1 deletions
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2
mm/memcontrol.c
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@ -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