tcp/dccp: fix lockdep issue when SYN is backlogged

[sfrench/cifs-2.6.git] / net / dccp / input.c

diff --git a/net/dccp/input.c b/net/dccp/input.c
index d28d46bff6ab43441f34284ec975c1e052a774d0..85d6c879383da8994c6b20cd1e49e0f667a07482 100644 (file)
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -606,11 +606,13 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
        if (sk->sk_state == DCCP_LISTEN) {
                if (dh->dccph_type == DCCP_PKT_REQUEST) {
                        /* It is possible that we process SYN packets from backlog,
-                        * so we need to make sure to disable BH right there.
+                        * so we need to make sure to disable BH and RCU right there.
                         */
+                       rcu_read_lock();
                        local_bh_disable();
                        acceptable = inet_csk(sk)->icsk_af_ops->conn_request(sk, skb) >= 0;
                        local_bh_enable();
+                       rcu_read_unlock();
                        if (!acceptable)
                                return 1;
                        consume_skb(skb);