fix crash in gtk_synthesize_crossing_events()

prevent accessing on a NULL variable. Fixes #5190
2022-09-17 23:00:30 -04:00
1 changed files with 1 additions and 1 deletions
--- a/gtk/gtkmain.c
+++ b/gtk/gtkmain.c
@@ -1205,7 +1205,7 @@ gtk_synthesize_crossing_events (GtkRoot         *toplevel,
          GtkWidget *w;

          crossing.old_descendent = NULL;
-          for (w = old_target; w != ancestor; w = _gtk_widget_get_parent (w))
+          for (w = old_target; w && w != ancestor; w = _gtk_widget_get_parent (w))
            crossing.old_descendent = w;

          seen_ancestor = TRUE;