--- ../linux-2.6.4.orig/net/ipv4/devinet.c	2004-03-12 12:17:31.000000000 +0100
+++ ../linux-2.6.4/net/ipv4/devinet.c	2004-03-25 13:07:24.000000000 +0100
@@ -183,7 +183,10 @@
 
 	in_dev->dead = 1;
 
-	ip_mc_destroy_dev(in_dev);
+	/* If the device isn't up, the multicast info isn't
+	 * initialized. */
+	if (in_dev->dev->flags & IFF_UP)
+		ip_mc_destroy_dev(in_dev);
 
 	while ((ifa = in_dev->ifa_list) != NULL) {
 		inet_del_ifa(in_dev, &in_dev->ifa_list, 0);