Merge branch 'for-5.5/whiskers' into for-linus

[linux.git] / net / ipv4 / tcp_timer.c

diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 05be564414e9b4aad64321e381fc0afa10980190..dd5a6317a8018a45ad609f832ced6df2937ad453 100644 (file)
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -386,15 +386,13 @@ abort:            tcp_write_err(sk);
  *     Timer for Fast Open socket to retransmit SYNACK. Note that the
  *     sk here is the child socket, not the parent (listener) socket.
  */
-static void tcp_fastopen_synack_timer(struct sock *sk)
+static void tcp_fastopen_synack_timer(struct sock *sk, struct request_sock *req)
 {
        struct inet_connection_sock *icsk = inet_csk(sk);
        int max_retries = icsk->icsk_syn_retries ? :
            sock_net(sk)->ipv4.sysctl_tcp_synack_retries + 1; /* add one more retry for fastopen */
        struct tcp_sock *tp = tcp_sk(sk);
-       struct request_sock *req;
 
-       req = tcp_sk(sk)->fastopen_rsk;
        req->rsk_ops->syn_ack_timeout(req);
 
        if (req->num_timeout >= max_retries) {
@@ -435,11 +433,14 @@ void tcp_retransmit_timer(struct sock *sk)
        struct tcp_sock *tp = tcp_sk(sk);
        struct net *net = sock_net(sk);
        struct inet_connection_sock *icsk = inet_csk(sk);
+       struct request_sock *req;
 
-       if (tp->fastopen_rsk) {
+       req = rcu_dereference_protected(tp->fastopen_rsk,
+                                       lockdep_sock_is_held(sk));
+       if (req) {
                WARN_ON_ONCE(sk->sk_state != TCP_SYN_RECV &&
                             sk->sk_state != TCP_FIN_WAIT1);
-               tcp_fastopen_synack_timer(sk);
+               tcp_fastopen_synack_timer(sk, req);
                /* Before we receive ACK to our SYN-ACK don't retransmit
                 * anything else (e.g., data or FIN segments).
                 */