From adfd20273c64d9dff5b0633c1a705d22b278dc43 Mon Sep 17 00:00:00 2001
From: Hiroki Sato <hrs@FreeBSD.org>
Date: Mon, 4 Jul 2011 03:19:06 +0000
Subject: [PATCH] Add sanity check for ifm_version in struct if_msghdr.

---
 usr.sbin/rtadvd/if.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/usr.sbin/rtadvd/if.c b/usr.sbin/rtadvd/if.c
index 302c33447c15..8722a056a9dc 100644
--- a/usr.sbin/rtadvd/if.c
+++ b/usr.sbin/rtadvd/if.c
@@ -105,6 +105,12 @@ if_nametosdl(char *name)
 	lim = buf + len;
 	for (next = buf; next < lim; next += ifm->ifm_msglen) {
 		ifm = (struct if_msghdr *)next;
+		if (ifm->ifm_version != RTM_VERSION) {
+			syslog(LOG_ERR,
+			    "<%s> RTM_VERSION mismatch (%d != %d).",
+			    __func__, ifm->ifm_version, RTM_VERSION);
+			continue;
+		}
 		if (ifm->ifm_type == RTM_IFINFO) {
 			sa = (struct sockaddr *)(ifm + 1);
 			get_rtaddrs(ifm->ifm_addrs, sa, rti_info);