flimflam: fix use-after-free of hidden network

plugins/newwifi.c

 /*
  *  New WiFi - communicate with wpa_supplicant using the "new D-Bus api"
  *
  *  This file initially created by Google, Inc.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 as
  *  published by the Free Software Foundation.
  *
  *  This program is distributed in the hope that it will be useful,
@@ skipping 2776 matching lines @@
                         network_disable(task, handle);
                 /*
                  * Clear our state in case of an error.  Should not happen.
                  * TODO(sleffler) add diagnostic
                  */
                 if (task->current_bss == network) {
                         connman_network_unref(task->current_bss);
                         task->current_bss = NULL;
                 }
         }
+        /* NB: caller marks network disconnected on 0 return */
         return 0;
 }
 
 static struct connman_network_driver supplicant_network_driver = {
         .name           = "wifi",
         .type           = CONNMAN_NETWORK_TYPE_WIFI,
         .probe          = supplicant_network_probe,
         .remove         = supplicant_network_remove,
         .connect        = supplicant_network_connect,
         .disconnect     = supplicant_network_disconnect,
@@ skipping 151 matching lines @@
         dbus_bus_remove_match(connection, bss_rule, NULL);
         dbus_bus_remove_match(connection, interface_rule, NULL);
         dbus_connection_flush(connection);
         dbus_connection_remove_filter(connection, supplicant_filter, NULL);
         dbus_connection_unref(connection);
         connection = NULL;
 }
 
 CONNMAN_PLUGIN_DEFINE(newwifi, "New WiFi interface", VERSION,
     CONNMAN_PLUGIN_PRIORITY_DEFAULT, new_wifi_init, new_wifi_finis)