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tcp: Don't change unlocked socket state in tcp_v4_err().
Alexey Kuznetsov noticed a regression introduced by
commit f1ecd5d9e7
("Revert Backoff [v3]: Revert RTO on ICMP destination unreachable")
The RTO and timer modification code added to tcp_v4_err()
doesn't check sock_owned_by_user(), which if true means we
don't have exclusive access to the socket and therefore cannot
modify it's critical state.
Just skip this new code block if sock_owned_by_user() is true
and eliminate the now superfluous sock_owned_by_user() code
block contained within.
Reported-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
CC: Damian Lukowski <damian@tvk.rwth-aachen.de>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
This commit is contained in:
parent
5ef41308f9
commit
8f49c2703b
@ -415,6 +415,9 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
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!icsk->icsk_backoff)
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break;
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if (sock_owned_by_user(sk))
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break;
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icsk->icsk_backoff--;
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inet_csk(sk)->icsk_rto = __tcp_set_rto(tp) <<
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icsk->icsk_backoff;
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@ -429,11 +432,6 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
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if (remaining) {
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inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
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remaining, TCP_RTO_MAX);
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} else if (sock_owned_by_user(sk)) {
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/* RTO revert clocked out retransmission,
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* but socket is locked. Will defer. */
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inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
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HZ/20, TCP_RTO_MAX);
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} else {
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/* RTO revert clocked out retransmission.
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* Will retransmit now */
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