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Make sure tcp_mss() has the same check as tcp_mss_update() to have t_maxseg set

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to at least 64.

This is still just a coverup to avoid kernel panic and not an actual fix.

PR:			213232
Reviewed by:		glebius
MFC after:		1 week
Sponsored by:		Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D8272
This commit is contained in:
Hiren Panchasara 2016-10-18 02:40:25 +00:00
parent 4299711473
commit 784ce8fad2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=307545
1 changed files with 9 additions and 1 deletions
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10
sys/netinet/tcp_input.c
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@ -3758,7 +3758,15 @@ tcp_mss(struct tcpcb *tp, int offer)
(void)sbreserve_locked(&so->so_snd, bufsize, so, NULL);
}
SOCKBUF_UNLOCK(&so->so_snd);
tp->t_maxseg = mss;
/*
* Sanity check: make sure that maxseg will be large
* enough to allow some data on segments even if the
* all the option space is used (40bytes). Otherwise
* funny things may happen in tcp_output.
*
* XXXGL: shouldn't we reserve space for IP/IPv6 options?
*/
tp->t_maxseg = max(mss, 64);
SOCKBUF_LOCK(&so->so_rcv);
if ((so->so_rcv.sb_hiwat == V_tcp_recvspace) && metrics.rmx_recvpipe)