[gnome-settings-daemon] print-notifications: detect malformed d-bus signals

[Marek KaÅÃk <mkasik src gnome org>]

commit 7d035a27f3f8c6056e96731ff9edafde9f785353
Author: Lars Uebernickel <lars uebernickel canonical com>
Date:   Wed Dec 7 16:17:57 2011 +0100

    print-notifications: detect malformed d-bus signals
    
    Fixes a crash that happens when receiving a d-bus call with an invalid
    number of arguments.  The issue was first reported at lp #893676.  A
    patch to CUPS which makes it stop sending those malformed signals has
    been submitted to cups.org as STR #3984. (#665689)

 .../gsd-print-notifications-manager.c              |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/plugins/print-notifications/gsd-print-notifications-manager.c b/plugins/print-notifications/gsd-print-notifications-manager.c
index 3a9adbe..65b2946 100644
--- a/plugins/print-notifications/gsd-print-notifications-manager.c
+++ b/plugins/print-notifications/gsd-print-notifications-manager.c
@@ -405,6 +405,10 @@ on_cups_notification (GDBusConnection *connection,
                         g_free (job_uri);
                 }
         }
+        else {
+                g_warning ("Invalid number of parameters for signal '%s'", signal_name);
+                return;
+        }
 
         if (g_strcmp0 (signal_name, "PrinterAdded") == 0) {
                 cupsFreeDests (manager->priv->num_dests, manager->priv->dests);