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| author | Glauber Costa <glommer@parallels.com> | 2013-02-22 16:34:57 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-23 17:50:18 -0800 |
| commit | e4715f01be697a3730c78f8ffffb595591d6a88c (patch) | |
| tree | 6ba363f7454d0b8e6b4db8997c8b7fa587f20279 | |
| parent | 692e89abd154b04d212dce0c18a449bda15aac04 (diff) | |
| download | linux-e4715f01be697a3730c78f8ffffb595591d6a88c.tar.gz | |
memcg: avoid dangling reference count in creation failure.
When use_hierarchy is enabled, we acquire an extra reference count in our parent during cgroup creation. We don't release it, though, if any failure exist in the creation process. Signed-off-by: Glauber Costa <glommer@parallels.com> Reported-by: Michal Hocko <mhocko@suse.cz> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Tejun Heo <tj@kernel.org> Cc: Hiroyuki Kamezawa <kamezawa.hiroyuki@gmail.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/memcontrol.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index f4f41c36e703..60d28e36f0e0 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -6196,6 +6196,8 @@ 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; } |