[src/trunk]: src/sys/netinet Add XXX.

[maxv <maxv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/195f070dc75a
branches:  trunk
changeset: 832692:195f070dc75a
user:      maxv <maxv%NetBSD.org@localhost>
date:      Wed May 23 18:40:29 2018 +0000

description:
Add XXX.

diffstat:

 sys/netinet/tcp_subr.c |  8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diffs (29 lines):

diff -r 232ca035803f -r 195f070dc75a sys/netinet/tcp_subr.c
--- a/sys/netinet/tcp_subr.c    Wed May 23 16:04:13 2018 +0000
+++ b/sys/netinet/tcp_subr.c    Wed May 23 18:40:29 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: tcp_subr.c,v 1.279 2018/05/03 07:13:48 maxv Exp $      */
+/*     $NetBSD: tcp_subr.c,v 1.280 2018/05/23 18:40:29 maxv Exp $      */
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -91,7 +91,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: tcp_subr.c,v 1.279 2018/05/03 07:13:48 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tcp_subr.c,v 1.280 2018/05/23 18:40:29 maxv Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_inet.h"
@@ -1918,6 +1918,10 @@
        if (tp->t_in6pcb)
                mss -= ip6_optlen(tp->t_in6pcb);
 #endif
+       /*
+        * XXX XXX What if mss goes negative or zero? This can happen if a
+        * socket has large IPv6 options. We crash below.
+        */
 
        /*
         * If there's a pipesize, change the socket buffer to that size.