From 75ee03cb27a61610651d753796baf19fd0577341 Mon Sep 17 00:00:00 2001
From: David Greenman <dg@FreeBSD.org>
Date: Mon, 8 Aug 1994 10:58:30 +0000
Subject: [PATCH] Enforce the mtu to between the range 1-65535 before calling
 the driver ioctl routine.

---
 sys/net/if.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sys/net/if.c b/sys/net/if.c
index 975bf780761d..5a60f6eafbf3 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)if.c	8.3 (Berkeley) 1/4/94
- * $Id: if.c,v 1.2 1994/08/02 07:46:05 davidg Exp $
+ * $Id: if.c,v 1.3 1994/08/08 10:49:18 davidg Exp $
  */
 
 #include <sys/param.h>
@@ -520,6 +520,8 @@ ifioctl(so, cmd, data, p)
 			return (error);
 		if (ifp->if_ioctl == NULL)
 			return (EOPNOTSUPP);
+		if (ifr->ifr_mtu < 1 || ifr->ifr_mtu > 65535)
+			return (EINVAL);
 		return ((*ifp->if_ioctl)(ifp, cmd, data));
 
 	case SIOCADDMULTI: