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Fix edge cases with ticks wrapping from INT_MAX to INT_MIN in the handling

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of the per-tcpcb t_badtrxtwin.

Submitted by:	bde
This commit is contained in:
John Baldwin 2009-06-16 19:00:12 +00:00
parent 9f78a87a06
commit 6dfb8b316c
1 changed files with 2 additions and 2 deletions
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4
sys/netinet/tcp_input.c
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@ -1296,7 +1296,7 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so,
* "bad retransmit" recovery.
*/
if (tp->t_rxtshift == 1 &&
ticks < tp->t_badrxtwin) {
(int)(ticks - tp->t_badrxtwin) < 0) {
TCPSTAT_INC(tcps_sndrexmitbad);
tp->snd_cwnd = tp->snd_cwnd_prev;
tp->snd_ssthresh =
@ -2253,7 +2253,7 @@ process_ACK:
* original cwnd and ssthresh, and proceed to transmit where
* we left off.
*/
if (tp->t_rxtshift == 1 && ticks < tp->t_badrxtwin) {
if (tp->t_rxtshift == 1 && (int)(ticks - tp->t_badrxtwin) < 0) {
TCPSTAT_INC(tcps_sndrexmitbad);
tp->snd_cwnd = tp->snd_cwnd_prev;
tp->snd_ssthresh = tp->snd_ssthresh_prev;