From 36e9d2ebcc15d029b33f42a36146ab5a5bcfcfe7 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 13 May 2014 11:28:30 -0400 Subject: cgroup: fix rcu_read_lock() leak in update_if_frozen() While updating cgroup_freezer locking, 68fafb77d827 ("cgroup_freezer: replace freezer->lock with freezer_mutex") introduced a bug in update_if_frozen() where it returns with rcu_read_lock() held. Fix it by adding rcu_read_unlock() before returning. Signed-off-by: Tejun Heo Reported-by: kbuild test robot --- kernel/cgroup_freezer.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c index 12ead0b766ee..345628c78b5b 100644 --- a/kernel/cgroup_freezer.c +++ b/kernel/cgroup_freezer.c @@ -267,8 +267,10 @@ static void update_if_frozen(struct cgroup_subsys_state *css) struct freezer *child = css_freezer(pos); if ((child->state & CGROUP_FREEZER_ONLINE) && - !(child->state & CGROUP_FROZEN)) + !(child->state & CGROUP_FROZEN)) { + rcu_read_unlock(); return; + } } rcu_read_unlock(); -- cgit v1.2.3