Index: head/usr.sbin/ctld/kernel.c
===================================================================
--- head/usr.sbin/ctld/kernel.c
+++ head/usr.sbin/ctld/kernel.c
@@ -238,10 +238,16 @@
 		cur_lun->backend_type = str;
 		str = NULL;
 	} else if (strcmp(name, "lun_type") == 0) {
+		if (str == NULL)
+			log_errx(1, "%s: %s missing its argument", __func__, name);
 		cur_lun->device_type = strtoull(str, NULL, 0);
 	} else if (strcmp(name, "size") == 0) {
+		if (str == NULL)
+			log_errx(1, "%s: %s missing its argument", __func__, name);
 		cur_lun->size_blocks = strtoull(str, NULL, 0);
 	} else if (strcmp(name, "blocksize") == 0) {
+		if (str == NULL)
+			log_errx(1, "%s: %s missing its argument", __func__, name);
 		cur_lun->blocksize = strtoul(str, NULL, 0);
 	} else if (strcmp(name, "serial_number") == 0) {
 		cur_lun->serial_number = str;
@@ -357,15 +363,23 @@
 		cur_port->port_name = str;
 		str = NULL;
 	} else if (strcmp(name, "physical_port") == 0) {
+		if (str == NULL)
+			log_errx(1, "%s: %s missing its argument", __func__, name);
 		cur_port->pp = strtoul(str, NULL, 0);
 	} else if (strcmp(name, "virtual_port") == 0) {
+		if (str == NULL)
+			log_errx(1, "%s: %s missing its argument", __func__, name);
 		cur_port->vp = strtoul(str, NULL, 0);
 	} else if (strcmp(name, "cfiscsi_target") == 0) {
 		cur_port->cfiscsi_target = str;
 		str = NULL;
 	} else if (strcmp(name, "cfiscsi_state") == 0) {
+		if (str == NULL)
+			log_errx(1, "%s: %s missing its argument", __func__, name);
 		cur_port->cfiscsi_state = strtoul(str, NULL, 0);
 	} else if (strcmp(name, "cfiscsi_portal_group_tag") == 0) {
+		if (str == NULL)
+			log_errx(1, "%s: %s missing its argument", __func__, name);
 		cur_port->cfiscsi_portal_group_tag = strtoul(str, NULL, 0);
 	} else if (strcmp(name, "ctld_portal_group_name") == 0) {
 		cur_port->ctld_portal_group_name = str;