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-rw-r--r--net/sched/cls_cgroup.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index 4c1567854f95..706a160142ea 100644
--- a/net/sched/cls_cgroup.c
+++ b/net/sched/cls_cgroup.c
@@ -32,6 +32,8 @@ static int cls_cgroup_classify(struct sk_buff *skb, const struct tcf_proto *tp,
struct cls_cgroup_head *head = rcu_dereference_bh(tp->root);
u32 classid = task_get_classid(skb);
+ if (unlikely(!head))
+ return -1;
if (!classid)
return -1;
if (!tcf_em_tree_match(skb, &head->ematches, NULL))