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tcp: exit if nothing to retransmit on RTO timeout

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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.

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>
This commit is contained in:
Yuchung Cheng 2019-01-16 15:05:28 -08:00 • committed by David S. Miller
parent 9b420eff9f
commit 88f8598d0a
1 changed files with 2 additions and 4 deletions
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6
net/ipv4/tcp_timer.c
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@ -443,10 +443,8 @@ void tcp_retransmit_timer(struct sock *sk)
*/
return;
}
if (!tp->packets_out)
goto out;
WARN_ON(tcp_rtx_queue_empty(sk));
if (!tp->packets_out || WARN_ON_ONCE(tcp_rtx_queue_empty(sk)))
return;
tp->tlp_high_seq = 0;