3.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Michal Hocko <mho...@suse.cz>
commit fa460c2d37870e0a6f94c70e8b76d05ca11b6db0 upstream.
This reverts commit e4715f01be697a.
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: Michal Hocko <mho...@suse.cz>
Signed-off-by: Li Zefan <lize...@huawei.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hir...@jp.fujitsu.com>
Cc: Hugh Dickins <hu...@google.com>
Cc: Tejun Heo <t...@kernel.org>
Cc: Glauber Costa <glom...@openvz.org>
Cc: Johannes Weiner <han...@cmpxchg.org>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
mm/memcontrol.c | 2 --
1 file changed, 2 deletions(-)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6303,8 +6303,6 @@ mem_cgroup_css_online(struct cgroup *con
* call __mem_cgroup_free, so return directly
*/
mem_cgroup_put(memcg);
- if (parent->use_hierarchy)
- mem_cgroup_put(parent);
}
return error;
}
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