[evolution] Bug #640382 - Prevent a crash in e_week_view_on_text_item_event()

[Milan Crha <mcrha src gnome org>]

commit af81b13a8994954b8c722c23e8dc073466c962f3
Author: Milan Crha <mcrha redhat com>
Date:   Thu Oct 17 11:22:29 2013 +0200

    Bug #640382 - Prevent a crash in e_week_view_on_text_item_event()

 calendar/gui/e-week-view.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/calendar/gui/e-week-view.c b/calendar/gui/e-week-view.c
index 3751e64..92fca66 100644
--- a/calendar/gui/e-week-view.c
+++ b/calendar/gui/e-week-view.c
@@ -3290,6 +3290,7 @@ tooltip_event_cb (GnomeCanvasItem *item,
                if (view->editing_event_num == -1) {
                        ECalendarViewEventData *data;
 
+                       g_return_val_if_fail (pevent != NULL, FALSE);
                        data = g_malloc (sizeof (ECalendarViewEventData));
 
                        pevent->x = ((GdkEventCrossing *) event)->x_root;
@@ -3311,6 +3312,8 @@ tooltip_event_cb (GnomeCanvasItem *item,
                        return FALSE;
                }
                case GDK_MOTION_NOTIFY:
+                       g_return_val_if_fail (pevent != NULL, FALSE);
+
                        pevent->x = ((GdkEventMotion *) event)->x_root;
                        pevent->y = ((GdkEventMotion *) event)->y_root;
                        pevent->tooltip = (GtkWidget *) g_object_get_data (G_OBJECT (view), "tooltip-window");
@@ -3964,6 +3967,7 @@ e_week_view_on_text_item_event (GnomeCanvasItem *item,
                g_object_set_data ((GObject *) item, "event-num", GINT_TO_POINTER (nevent));
 
                pevent = tooltip_get_view_event (week_view, -1, nevent);
+               g_return_val_if_fail (pevent != NULL, FALSE);
 
                data = g_malloc (sizeof (ECalendarViewEventData));
 
@@ -3991,6 +3995,8 @@ e_week_view_on_text_item_event (GnomeCanvasItem *item,
 
                return FALSE;
        case GDK_MOTION_NOTIFY:
+               g_return_val_if_fail (pevent != NULL, FALSE);
+
                gdk_event_get_root_coords (
                        gdk_event, &event_x_root, &event_y_root);