From 91c0ffd6cf1ffb6a86c3ce4d6365ab0843ad9c37 Mon Sep 17 00:00:00 2001
From: Tadeo Kondrak <me@tadeo.ca>
Date: Wed, 4 Mar 2020 14:47:26 -0700
Subject: [PATCH] Null check sway_layer_surface when checking damage

Before this change, an overlay layer-shell surface without a buffer
attached would segfault the compositor on screen damage.
---
 sway/desktop/output.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sway/desktop/output.c b/sway/desktop/output.c
index ec3d6424..e6ed9be0 100644
--- a/sway/desktop/output.c
+++ b/sway/desktop/output.c
@@ -388,6 +388,9 @@ bool output_has_opaque_overlay_layer_surface(struct sway_output *output) {
 		struct wlr_surface *wlr_surface = wlr_layer_surface_v1->surface;
 		struct sway_layer_surface *sway_layer_surface =
 			layer_from_wlr_layer_surface_v1(wlr_layer_surface_v1);
+		if (sway_layer_surface == NULL) {
+			continue;
+		}
 		pixman_box32_t output_box = {
 			.x2 = output->width,
 			.y2 = output->height,