tcp: clear icsk_backoff in tcp_write_queue_purge()
soukjin bae reported a crash in tcp_v4_err() handling ICMP_DEST_UNREACH after tcp_write_queue_head(sk) returned a NULL pointer. Current logic should have prevented this : if (seq != tp->snd_una || !icsk->icsk_retransmits || !icsk->icsk_backoff || fastopen) break; Problem is the write queue might have been purged and icsk_backoff has not been cleared. Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: soukjin bae <soukjin.bae@samsung.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -2528,6 +2528,7 @@ void tcp_write_queue_purge(struct sock *sk)
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sk_mem_reclaim(sk);
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tcp_clear_all_retrans_hints(tcp_sk(sk));
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tcp_sk(sk)->packets_out = 0;
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inet_csk(sk)->icsk_backoff = 0;
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}
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int tcp_disconnect(struct sock *sk, int flags)
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@ -2576,7 +2577,6 @@ int tcp_disconnect(struct sock *sk, int flags)
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tp->write_seq += tp->max_window + 2;
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if (tp->write_seq == 0)
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tp->write_seq = 1;
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icsk->icsk_backoff = 0;
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tp->snd_cwnd = 2;
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icsk->icsk_probes_out = 0;
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tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
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