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tcp: fix computation of offset

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Only update the offset if actually retransmitting from the
scoreboard. If not done correctly, this may result in
trying to (re)-transmit data not being being in the socket
buffe and therefore resulting in a panic.

PR:			264257
PR:			263445
PR:			260393
Reviewed by:		rscheff@
MFC after:		3 days
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D36626
This commit is contained in:
Michael Tuexen 2022-09-19 12:42:43 +02:00
parent 55760984d5
commit 6d9e911fba
1 changed files with 3 additions and 3 deletions
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6
sys/netinet/tcp_output.c
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@ -338,10 +338,10 @@ tcp_default_output(struct tcpcb *tp)
len = ((int32_t)ulmin(cwin,
SEQ_SUB(p->end, p->rxmit)));
}
off = SEQ_SUB(p->rxmit, tp->snd_una);
KASSERT(off >= 0,("%s: sack block to the left of una : %d",
__func__, off));
if (len > 0) {
off = SEQ_SUB(p->rxmit, tp->snd_una);
KASSERT(off >= 0,("%s: sack block to the left of una : %d",
__func__, off));
sack_rxmit = 1;
sendalot = 1;
TCPSTAT_INC(tcps_sack_rexmits);