Fix layer surface crash on output destroy

Before freeing sway_output, NULL the wlr_output reference to it. Check for that
NULL in layer_shell handle_destroy. Don't damage null container in unmap.
Additionaly, terminate swaybg if its output is being disabled.

1 files changed, 7 insertions, 2 deletions

diff --git a/sway/desktop/layer_shell.c b/sway/desktop/layer_shell.c
index 03419ac1..c904880d 100644
--- a/sway/desktop/layer_shell.c
+++ b/sway/desktop/layer_shell.c
@@ -255,6 +255,9 @@ static void unmap(struct sway_layer_surface *sway_layer) {
                 return;
         }
         struct sway_output *output = wlr_output->data;
+        if (output == NULL) {
+                return;
+        }
         output_damage_surface(output, sway_layer->geo.x, sway_layer->geo.y,
                 sway_layer->layer_surface->surface, true);
 }
@@ -274,9 +277,11 @@ static void handle_destroy(struct wl_listener *listener, void *data) {
         wl_list_remove(&sway_layer->surface_commit.link);
         if (sway_layer->layer_surface->output != NULL) {
                 struct sway_output *output = sway_layer->layer_surface->output->data;
-                arrange_layers(output);
-
+                if (output != NULL) {
+                        arrange_layers(output);
+                }
                 wl_list_remove(&sway_layer->output_destroy.link);
+                sway_layer->layer_surface->output = NULL;
         }
         free(sway_layer);
 }