net_sched: fix suspicious RCU usage in cls_bpf_classify()

Fixes: commit 1f947bf151e90ec0baad2948 ("net: sched: rcu'ify cls_bpf")
Cc: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c
index 6a7386e6e5a8831c0d237477a7238f4fd81acb1a..4e3f5bfc0b26d7ed6ea1699bac3ecef78a578e23 100644 (file)
--- a/net/sched/cls_bpf.c
+++ b/net/sched/cls_bpf.c
@@ -52,7 +52,7 @@ static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = {
 static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
                            struct tcf_result *res)
 {
-       struct cls_bpf_head *head = rcu_dereference(tp->root);
+       struct cls_bpf_head *head = rcu_dereference_bh(tp->root);
        struct cls_bpf_prog *prog;
        int ret;