--- /usr/src/linux-2.4.10-pre14/net/ipv4/ipip.c	Sat Sep 22 01:18:30 2001
+++ net/ipv4/ipip.c	Sat Sep 22 02:39:07 2001
@@ -758,6 +758,7 @@
 			err = -EPERM;
 			if (t == &ipip_fb_tunnel)
 				goto done;
+			dev = t->dev;
 		}
 		err = unregister_netdevice(dev);
 		break;