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.

1 files changed, 3 insertions, 0 deletions

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,