Fix network cleanup on error

src/lxc/conf.c

@@ -1702,13 +1702,19 @@ void lxc_delete_network(struct lxc_list *network)
 		if (netdev->ifindex == 0)
 			continue;
 
-		/* Recent kernels already delete the virtual devices */
-		if (netdev->type != LXC_NET_PHYS)
+		if (netdev->type == LXC_NET_PHYS) {
+			if (lxc_netdev_rename_by_index(netdev->ifindex, netdev->link))
+				WARN("failed to rename to the initial name the " \
+				     "netdev '%s'", netdev->link);
 			continue;
+		}
 
-		if (lxc_netdev_rename_by_index(netdev->ifindex, netdev->link))
-			WARN("failed to rename to the initial name the netdev '%s'",
-			     netdev->link);
+		/* Recent kernel remove the virtual interfaces when the network
+		 * namespace is destroyed but in case we did not moved the
+		 * interface to the network namespace, we have to destroy it
+		 */
+		if (lxc_netdev_delete_by_index(netdev->ifindex))
+			WARN("failed to remove interface '%s'", netdev->name);
 	}
 }
 

src/lxc/start.c

@@ -490,7 +490,6 @@ int lxc_spawn(struct lxc_handler *handler)
 		}
 	}
 
-
 	/* Create a process in a new set of namespaces */
 	handler->pid = lxc_clone(do_start, handler, clone_flags);
 	if (handler->pid < 0) {