[PATCH v4.14] tcp: exit if nothing to retransmit on RTO timeout

From: Eric Dumazet <edumazet@google.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "David S . Miller" <davem@davemloft.net>,
	netdev <netdev@vger.kernel.org>,
	Eric Dumazet <edumazet@google.com>,
	Eric Dumazet <eric.dumazet@gmail.com>,
	Yuchung Cheng <ycheng@google.com>,
	Neal Cardwell <ncardwell@google.com>,
	Soheil Hassas Yeganeh <soheil@google.com>
Subject: [PATCH v4.14] tcp: exit if nothing to retransmit on RTO timeout
Date: Fri,  6 Dec 2019 10:20:16 -0800	[thread overview]
Message-ID: <20191206182016.137529-1-edumazet@google.com> (raw)

Two upstream commits squashed together for v4.14 stable :

 commit 88f8598d0a302a08380eadefd09b9f5cb1c4c428 upstream.

  Previously TCP only warns if its RTO timer fires and the
  retransmission queue is empty, but it'll cause null pointer
  reference later on. It's better to avoid such catastrophic failure
  and simply exit with a warning.

Squashed with "tcp: refactor tcp_retransmit_timer()" :

 commit 0d580fbd2db084a5c96ee9c00492236a279d5e0f upstream.

  It appears linux-4.14 stable needs a backport of commit
  88f8598d0a30 ("tcp: exit if nothing to retransmit on RTO timeout")

  Since tcp_rtx_queue_empty() is not in pre 4.15 kernels,
  let's refactor tcp_retransmit_timer() to only use tcp_rtx_queue_head()

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/ipv4/tcp_timer.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 592d6e9967a916076ffcab37857d703c1567d7df..95dca02f8c4fc0154016b8bc5ee027fcc19e1061 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -413,6 +413,7 @@ 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 sk_buff *skb;
 
 	if (tp->fastopen_rsk) {
 		WARN_ON_ONCE(sk->sk_state != TCP_SYN_RECV &&
@@ -423,10 +424,13 @@ void tcp_retransmit_timer(struct sock *sk)
 		 */
 		return;
 	}
+
 	if (!tp->packets_out)
-		goto out;
+		return;
 
-	WARN_ON(tcp_write_queue_empty(sk));
+	skb = tcp_rtx_queue_head(sk);
+	if (WARN_ON_ONCE(!skb))
+		return;
 
 	tp->tlp_high_seq = 0;
 
@@ -459,7 +463,7 @@ void tcp_retransmit_timer(struct sock *sk)
 			goto out;
 		}
 		tcp_enter_loss(sk);
-		tcp_retransmit_skb(sk, tcp_write_queue_head(sk), 1);
+		tcp_retransmit_skb(sk, skb, 1);
 		__sk_dst_reset(sk);
 		goto out_reset_timer;
 	}
-- 
2.24.0.393.g34dc348eaf-goog

