1 files changed, 5 insertions, 3 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 4c2dd9f863f7..47e08c1b5bc3 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6009,11 +6009,13 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
                         if (th->fin)
                                 goto discard;
                         /* 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 = icsk->icsk_af_ops->conn_request(sk, skb) >= 0;
                         local_bh_enable();
+                        rcu_read_unlock();
 
                         if (!acceptable)
                                 return 1;
@@ -6367,8 +6369,8 @@ static bool tcp_syn_flood_action(const struct sock *sk,
         if (!queue->synflood_warned &&
             net->ipv4.sysctl_tcp_syncookies != 2 &&
             xchg(&queue->synflood_warned, 1) == 0)
-                pr_info("%s: Possible SYN flooding on port %d. %s.  Check SNMP counters.\n",
-                        proto, ntohs(tcp_hdr(skb)->dest), msg);
+                net_info_ratelimited("%s: Possible SYN flooding on port %d. %s.  Check SNMP counters.\n",
+                                     proto, ntohs(tcp_hdr(skb)->dest), msg);
 
         return want_cookie;
 }