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Fix potential crash where a user attempts to perform an implied

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connect in TCP while sending urgent data.  It is not clear what
purpose is served by doing this, but there's no good reason why it
shouldn't work.

Submitted by:	tjevans@raleigh.ibm.com via wpaul
This commit is contained in:
Garrett Wollman 1997-02-21 16:30:31 +00:00
parent 5d156f4397
commit ef53690bb4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=22962
1 changed files with 14 additions and 1 deletions
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15
sys/netinet/tcp_usrreq.c
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
* $FreeBSD$
* $Id$
*/
#include <sys/param.h>
@ -389,6 +389,19 @@ tcp_usr_send(struct socket *so, int flags, struct mbuf *m, struct mbuf *nam,
* Otherwise, snd_up should be one lower.
*/
sbappend(&so->so_snd, m);
if (nam && tp->t_state < TCPS_SYN_SENT) {
/*
* Do implied connect if not yet connected,
* initialize window to default value, and
* initialize maxseg/maxopd using peer's cached
* MSS.
*/
error = tcp_connect(tp, nam);
if (error)
goto out;
tp->snd_wnd = TTCP_CLIENT_SND_WND;
tcp_mss(tp, -1);
}
tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
tp->t_force = 1;
error = tcp_output(tp);