Index: usr.sbin/ctld/kernel.c
===================================================================
--- usr.sbin/ctld/kernel.c
+++ usr.sbin/ctld/kernel.c
@@ -365,22 +365,42 @@
 	} 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);
+		if (str) {
+			cur_port->pp = strtoul(str, NULL, 0);
+		}
+		else {
+			cur_port->pp = 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);
+		if (str) {
+			cur_port->vp = strtoul(str, NULL, 0);
+		}
+		else {
+			cur_port->vp = 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);
+		if (str) {
+			cur_port->cfiscsi_state = strtoul(str, NULL, 0);
+		}
+		else {
+			cur_port->cfiscsi_state = 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);
+		if (str) {
+			cur_port->cfiscsi_portal_group_tag = strtoul(str, NULL, 0);
+		}
+		else {
+			cur_port->cfiscsi_portal_group_tag = 0;
+		}
 	} else if (strcmp(name, "ctld_portal_group_name") == 0) {
 		cur_port->ctld_portal_group_name = str;
 		str = NULL;
@@ -697,13 +717,13 @@
 	req.reqdata.create.device_type = lun->l_device_type;
 
 	if (lun->l_serial != NULL) {
-		strncpy(req.reqdata.create.serial_num, lun->l_serial,
+		strlcpy(req.reqdata.create.serial_num, lun->l_serial,
 			sizeof(req.reqdata.create.serial_num));
 		req.reqdata.create.flags |= CTL_LUN_FLAG_SERIAL_NUM;
 	}
 
 	if (lun->l_device_id != NULL) {
-		strncpy(req.reqdata.create.device_id, lun->l_device_id,
+		strlcpy(req.reqdata.create.device_id, lun->l_device_id,
 			sizeof(req.reqdata.create.device_id));
 		req.reqdata.create.flags |= CTL_LUN_FLAG_DEVID;
 	}
@@ -785,7 +805,9 @@
 
 	bzero(&req, sizeof(req));
 
-	strlcpy(req.backend, lun->l_backend, sizeof(req.backend));
+	if (lun->l_backend) {
+		strlcpy(req.backend, lun->l_backend, sizeof(req.backend));
+	}
 	req.reqtype = CTL_LUNREQ_MODIFY;
 
 	req.reqdata.modify.lun_id = lun->l_ctl_lun;