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-rw-r--r--security/device_cgroup.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index ce14a31b1337..084c8e417564 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -589,9 +589,17 @@ static int propagate_exception(struct dev_cgroup *devcg_root,
static inline bool has_children(struct dev_cgroup *devcgroup)
{
- struct cgroup *cgrp = devcgroup->css.cgroup;
+ bool ret;
- return !list_empty(&cgrp->children);
+ /*
+ * FIXME: There may be lingering offline csses and this function
+ * may return %true when there isn't any userland-visible child
+ * which is incorrect for our purposes.
+ */
+ rcu_read_lock();
+ ret = css_next_child(NULL, &devcgroup->css);
+ rcu_read_unlock();
+ return ret;
}
/*