From 3bf351b29a026b91740a411c4f0d5e85901e4e2a Mon Sep 17 00:00:00 2001
From: Gleb Smirnoff <glebius@FreeBSD.org>
Date: Tue, 8 Oct 2013 08:16:17 +0000
Subject: [PATCH]   When destination parameter is missing, exit with a clear
 synopsis, instead of writing to kernel and printing EINVAL description.

PR:		bin/181532
Submitted by:	Kurt Jaeger <fbsd-pr opsec.eu>
Approved by:	re (hrs)
---
 sbin/route/route.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sbin/route/route.c b/sbin/route/route.c
index e575c711329..6c2bbe2084b 100644
--- a/sbin/route/route.c
+++ b/sbin/route/route.c
@@ -928,6 +928,11 @@ newroute(int argc, char **argv)
 		}
 	}
 
+	if (so[RTAX_DST].ss_len == 0) {
+		warnx("destination parameter required");
+		usage(NULL);
+	}
+
 	if (nrflags & F_FORCEHOST) {
 		nrflags |= F_ISHOST;
 #ifdef INET6