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tcp: fix off-by-one bug in RACK 

RACK should mark a packet lost when remaining wait time is zero.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Priyaranjan Jha <priyarjha@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuchung Cheng 2017-12-07 11:33:32 -08:00 committed by David S. Miller
parent cd1fc85b43
commit 428aec5e69
1 changed files with 3 additions and 3 deletions
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6
net/ipv4/tcp_recovery.c
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@ -80,12 +80,12 @@ static void tcp_rack_detect_loss(struct sock *sk, u32 *reo_timeout)
*/
remaining = tp->rack.rtt_us + reo_wnd -
tcp_stamp_us_delta(tp->tcp_mstamp, skb->skb_mstamp);
if (remaining < 0) {
if (remaining <= 0) {
tcp_rack_mark_skb_lost(sk, skb);
list_del_init(&skb->tcp_tsorted_anchor);
} else {
/* Record maximum wait time (+1 to avoid 0) */
*reo_timeout = max_t(u32, *reo_timeout, 1 + remaining);
/* Record maximum wait time */
*reo_timeout = max_t(u32, *reo_timeout, remaining);
}
}
}