Index: geom_vinum_list.c
===================================================================
RCS file: /usr/repo/src/sys/geom/vinum/geom_vinum_list.c,v
retrieving revision 1.3
diff -u -p -r1.3 geom_vinum_list.c
--- geom_vinum_list.c	6 Jan 2005 18:27:30 -0000	1.3
+++ geom_vinum_list.c	11 May 2005 18:22:22 -0000
@@ -71,7 +71,9 @@ gv_list(struct g_geom *gp, struct gctl_r
 	cmd = gctl_get_param(req, "cmd", NULL);
 
 	/* List specific objects or everything. */
-	if (!strcmp(cmd, "list") || !strcmp(cmd, "l")) {
+	if (cmd == NULL)
+		gctl_error(req, "no '%s' argument", "cmd");
+	else if (!strcmp(cmd, "list") || !strcmp(cmd, "l")) {
 		if (*argc) {
 			for (i = 0; i < *argc; i++) {
 				snprintf(buf, sizeof(buf), "argv%d", i);