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tree-wide: use die_if_null() for wlr_scene alloc failures
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wlr_scene_*_create() functions all allocate memory via calloc() and
return NULL if the allocation fails. Previously, the failures were
handled in any of 3 different ways:

 - sending a wayland protocol error
 - exiting labwc with an error
 - segfault (no NULL check at all)

Since labwc does not attempt to survive heap exhaustion in other
allocation paths (such as `znew`), it seems more consistent to use the
same die_if_null() check used in those paths to exit with an error.

For the three most common create() functions (tree, rect, buffer),
add small lab_wlr_ wrappers to common/scene-helpers.
This commit is contained in:
John Lindgren 2026-02-23 16:34:36 -05:00 • committed by Johan Malm
parent c4effef0ec
commit 16c5373be5
27 changed files with 155 additions and 141 deletions
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23
src/layers.c
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@ -561,10 +561,7 @@ create_popup(struct server *server, struct wlr_xdg_popup *wlr_popup,
popup->wlr_popup = wlr_popup;
popup->scene_tree =
wlr_scene_xdg_surface_create(parent, wlr_popup->base);
if (!popup->scene_tree) {
free(popup);
return NULL;
}
die_if_null(popup->scene_tree);
/* In support of IME popup */
wlr_popup->base->surface->data = popup->scene_tree;
@ -598,12 +595,6 @@ handle_popup_new_popup(struct wl_listener *listener, void *data)
lab_layer_popup->server, wlr_popup,
lab_layer_popup->scene_tree);
if (!new_popup) {
wl_resource_post_no_memory(wlr_popup->resource);
wlr_xdg_popup_destroy(wlr_popup);
return;
}
new_popup->output_toplevel_sx_box =
lab_layer_popup->output_toplevel_sx_box;
}
@ -664,12 +655,6 @@ handle_new_popup(struct wl_listener *listener, void *data)
};
struct lab_layer_popup *popup =
create_popup(server, wlr_popup, surface->tree);
if (!popup) {
wl_resource_post_no_memory(wlr_popup->resource);
wlr_xdg_popup_destroy(wlr_popup);
return;
}
popup->output_toplevel_sx_box = output_toplevel_sx_box;
if (surface->layer_surface->current.layer
@ -716,11 +701,7 @@ handle_new_layer_surface(struct wl_listener *listener, void *data)
surface->scene_layer_surface = wlr_scene_layer_surface_v1_create(
selected_layer, layer_surface);
if (!surface->scene_layer_surface) {
wlr_layer_surface_v1_destroy(layer_surface);
wlr_log(WLR_ERROR, "could not create layer surface");
return;
}
die_if_null(surface->scene_layer_surface);
/* In support of IME popup */
layer_surface->surface->data = surface->scene_layer_surface->tree;