[gnome-shell] notificationDaemon: Guard against invalid D-Bus object paths

[Mario Sanchez Prada <msanchez src gnome org>]

commit 1ef8722c52d8e88041b3af61c0ee082c2b40dee7
Author: Krzesimir Nowak <krzesimir kinvolk io>
Date:   Fri Nov 18 15:52:46 2016 +0100

    notificationDaemon: Guard against invalid D-Bus object paths
    
    When making any D-Bus call through the GDBus' proxy wrapper with an
    invalid D-Bus object path, gnome-shell hangs.
    
    Supposedly FdoApplicationProxy constructor should validate the passed
    D-Bus object path and throw an error if the path is invalid. Since it
    does not do that, we work it around by making sure that the deduced
    D-Bus object path is valid or throw an exception if the path is not.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=787902

 js/ui/notificationDaemon.js |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/notificationDaemon.js b/js/ui/notificationDaemon.js
index ed8870f..84bfec4 100644
--- a/js/ui/notificationDaemon.js
+++ b/js/ui/notificationDaemon.js
@@ -687,6 +687,8 @@ var GtkNotificationDaemonAppSource = new Lang.Class({
     _init: function(appId) {
         this._appId = appId;
         this._objectPath = objectPathFromAppId(appId);
+        if (!GLib.Variant.is_object_path(this._objectPath))
+            throw new InvalidAppError();
 
         this._app = Shell.AppSystem.get_default().lookup_app(appId + '.desktop');
         if (!this._app)