Messages in this thread Patch in this message | | | From | Vladimir Davydov <> | Subject | [PATCH] mm: memcontrol: fix possible css ref leak on oom | Date | Mon, 23 May 2016 19:02:10 +0300 |
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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.
Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com> --- mm/memcontrol.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 5b48cd25951b..ef8797d34039 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1608,7 +1608,7 @@ 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 -- 2.1.4
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