--- gdm-2.99.0/gui/simple-greeter/gdm-greeter-background.c.fix-crash-on-background-load-failure

+++ gdm-2.99.0/gui/simple-greeter/gdm-greeter-background.c

@@ -481,6 +481,10 @@ update_background (GdmGreeterBackground *background)

                 if (background->priv->pat == NULL) {

                         load_image (background);

+

+                        if (background->priv->pat == NULL)

+                                goto out;

+                       

                 }

                 if (background->priv->image_placement == BACKGROUND_SCALED) {

@@ -582,6 +586,7 @@ update_background (GdmGreeterBackground *background)

                 cairo_fill (cr);

         }

+out:

         cairo_destroy (cr);

 }