[evince] [shell] Safely get the screen from the message arguments

[Carlos Garcia Campos <carlosgc src gnome org>]

commit bf81d8f6045121a886dd37cde1e25c2e4e9da233
Author: Christian Persch <chpe gnome org>
Date:   Mon May 10 01:30:11 2010 +0200

    [shell] Safely get the screen from the message arguments
    
    Check for out-of-bounds.

 shell/ev-application.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/shell/ev-application.c b/shell/ev-application.c
index a09906c..050b396 100644
--- a/shell/ev-application.c
+++ b/shell/ev-application.c
@@ -644,7 +644,9 @@ method_call_cb (GDBusConnection       *connection,
         }
         g_variant_iter_free (iter);
 
-        if (display != NULL)
+        if (display != NULL &&
+            screen_number >= 0 &&
+            screen_number < gdk_display_get_n_screens (display))
                 screen = gdk_display_get_screen (display, screen_number);
         else
                 screen = gdk_screen_get_default ();