From 6b658142fd02bf3e447bab0310121f402e188aea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dag-Erling=20Sm=C3=B8rgrav?= <des@FreeBSD.org>
Date: Tue, 28 May 2002 14:29:56 +0000
Subject: [PATCH] Add some checks to prevent NULL dereferences.

Submitted by:	jhay
---
 sys/kern/tty.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/sys/kern/tty.c b/sys/kern/tty.c
index 1cd71ef8eb0..d571c72d076 100644
--- a/sys/kern/tty.c
+++ b/sys/kern/tty.c
@@ -2593,12 +2593,15 @@ sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
 		xt.xt_cancc = tp->t_canq.c_cc;
 		xt.xt_outcc = tp->t_outq.c_cc;
 		XT_COPY(line);
-		xt.xt_dev = dev2udev(tp->t_dev);
+		if (tp->t_dev)
+			xt.xt_dev = dev2udev(tp->t_dev);
 		XT_COPY(state);
 		XT_COPY(flags);
 		XT_COPY(timeout);
-		xt.xt_pgid = tp->t_pgrp->pg_id;
-		xt.xt_sid = tp->t_session->s_sid;
+		if (tp->t_pgrp)
+			xt.xt_pgid = tp->t_pgrp->pg_id;
+		if (tp->t_session)
+			xt.xt_sid = tp->t_session->s_sid;
 		XT_COPY(termios);
 		XT_COPY(winsize);
 		XT_COPY(column);