From 7b9754ed1f460f51c9aebe901f427423ce7ad45d Mon Sep 17 00:00:00 2001
From: Bruce Evans <bde@FreeBSD.org>
Date: Sun, 27 Nov 1994 15:29:57 +0000
Subject: [PATCH] Fix previous change: don't attempt to reserve cblocks if the
 tty is null.

---
 sys/net/if_ppp.c | 13 ++++++++-----
 sys/net/if_sl.c  | 13 ++++++++-----
 2 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/sys/net/if_ppp.c b/sys/net/if_ppp.c
index 826bcc60a4a8..3f4ca74c576a 100644
--- a/sys/net/if_ppp.c
+++ b/sys/net/if_ppp.c
@@ -69,7 +69,7 @@
  * Paul Mackerras (paulus@cs.anu.edu.au).
  */
 
-/* $Id: if_ppp.c,v 1.7 1994/11/23 08:29:44 ugen Exp $ */
+/* $Id: if_ppp.c,v 1.8 1994/11/26 19:23:59 bde Exp $ */
 /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
 
 #include "ppp.h"
@@ -1506,11 +1506,14 @@ pppioctl(ifp, cmd, data)
 	if (error = suser(p->p_ucred, &p->p_acflag))
 	    return (error);
 	if (ifr->ifr_mtu > PPP_MAXMTU)
-		error = EINVAL;
+	    error = EINVAL;
 	else {
-		sc->sc_if.if_mtu = ifr->ifr_mtu;
-		clist_alloc_cblocks(&((struct tty *) sc->sc_devp)->t_outq,
-				    sc->sc_if.if_mtu + PPP_HIWAT,
+	    struct tty *tp;
+
+	    sc->sc_if.if_mtu = ifr->ifr_mtu;
+	    tp = (struct tty *) sc->sc_devp;
+	    if (tp != NULL)
+		clist_alloc_cblocks(&tp->t_outq, sc->sc_if.if_mtu + PPP_HIWAT,
 				    sc->sc_if.if_mtu + PPP_HIWAT);
 	}
 	break;
diff --git a/sys/net/if_sl.c b/sys/net/if_sl.c
index 915bc4b077ac..281228466ba3 100644
--- a/sys/net/if_sl.c
+++ b/sys/net/if_sl.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)if_sl.c	8.6 (Berkeley) 2/1/94
- * $Id: if_sl.c,v 1.9 1994/10/08 01:40:22 phk Exp $
+ * $Id: if_sl.c,v 1.10 1994/11/26 19:24:00 bde Exp $
  */
 
 /*
@@ -883,11 +883,14 @@ slioctl(ifp, cmd, data)
 		if (ifr->ifr_mtu > SLTMAX)
 			error = EINVAL;
 		else {
+			struct tty *tp;
+
 			ifp->if_mtu = ifr->ifr_mtu;
-			clist_alloc_cblocks(
-				&sl_softc[ifp->if_unit].sc_ttyp->t_outq,
-					    ifp->if_mtu + SLIP_HIWAT,
-					    ifp->if_mtu + SLIP_HIWAT);
+			tp = sl_softc[ifp->if_unit].sc_ttyp;
+			if (tp != NULL)
+				clist_alloc_cblocks(&tp->t_outq,
+						    ifp->if_mtu + SLIP_HIWAT,
+						    ifp->if_mtu + SLIP_HIWAT);
 		}
 		break;