[PATCH 1/9] Revert "memcg: avoid dangling reference count in creationfailure."

From: Li Zefan
Date: Fri May 17 2013 - 03:04:25 EST

This reverts commit e4715f01be697a3730c78f8ffffb595591d6a88c

mem_cgroup_put is hierarchy aware so mem_cgroup_put(memcg) already drops
an additional reference from all parents so the additional
mem_cgrroup_put(parent) potentially causes use-after-free.

Cc: <stable@xxxxxxxxxxxxxxx> # 3.9.x
Signed-off-by: Michal Hocko <mhocko@xxxxxxx>
Signed-off-by: Li Zefan <lizefan@xxxxxxxxxx>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
mm/memcontrol.c | 2 --
1 file changed, 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index cb1c9de..5918e90 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6297,8 +6297,6 @@ mem_cgroup_css_online(struct cgroup *cont)
* call __mem_cgroup_free, so return directly
- if (parent->use_hierarchy)
- mem_cgroup_put(parent);
return error;

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