From: Michal Hocko <mho...@suse.cz>
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.
Signed-off-by: Li Zefan <lize...@huawei.com>
Signed-off-by: Michal Hocko <mho...@suse.cz>
---
mm/memcontrol.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 2364f4e..44cec72 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6250,8 +6250,6 @@ mem_cgroup_css_online(struct cgroup *cont)
* call __mem_cgroup_free, so return directly
*/
mem_cgroup_put(memcg);
- if (parent->use_hierarchy)
- mem_cgroup_put(parent);
}
return error;
}
--
1.8.0.2
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