subsurface_get_root_coords: break on NULL

It is possible for `wlr_surface_is_subsurface` to return true, but
`wlr_surface_from_wlr_surface` to be NULL. This adds a NULL check to the
value returned by `wlr_surface_from_wlr_surface` and breaks out of the
while loop in `subsurface_get_root_coords`.
master
Brian Ashworth 6 years ago committed by emersion
parent 1bccde68a4
commit d168d65f2c

@ -708,6 +708,9 @@ static void subsurface_get_root_coords(struct sway_view_child *child,
while (surface && wlr_surface_is_subsurface(surface)) {
struct wlr_subsurface *subsurface =
wlr_subsurface_from_wlr_surface(surface);
if (subsurface == NULL) {
break;
}
*root_sx += subsurface->current.x;
*root_sy += subsurface->current.y;
surface = subsurface->parent;

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