ruih: Check for mandatory arguments

GetCompatibleUI action must check for 2 mandatory arguments with the action.
Both the arguments can be empty but the element needs to be sent out in the
request.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/librygel-ruih/rygel-ruih-service.vala b/src/librygel-ruih/rygel-ruih-service.vala
index ba2cccfb..acc88e77 100644
--- a/src/librygel-ruih/rygel-ruih-service.vala
+++ b/src/librygel-ruih/rygel-ruih-service.vala
@@ -59,6 +59,11 @@ internal class Rygel.RuihService: Service {
                         out input_device_profile);
         action.get ("UIFilter", typeof (string), out input_ui_filter);
 
+        if (action.get_argument_count () < 2) {
+            action.return_error (402, _("Invalid argument"));
+            return;
+        }
+
         try {
             var manager = RuihServiceManager.get_default ();
             var compat_ui = manager.get_compatible_uis (input_device_profile,