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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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18
src/server.c
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@ -46,6 +46,8 @@
#include "action.h"
#include "common/macros.h"
#include "common/mem.h"
#include "common/scene-helpers.h"
#include "config/rcxml.h"
#include "config/session.h"
#include "decorations.h"
@ -555,10 +557,8 @@ server_init(struct server *server)
wl_list_init(&server->cycle.osd_outputs);
server->scene = wlr_scene_create();
if (!server->scene) {
wlr_log(WLR_ERROR, "unable to create scene");
exit(EXIT_FAILURE);
}
die_if_null(server->scene);
server->direct_scanout_enabled = server->scene->WLR_PRIVATE.direct_scanout;
/*
@ -586,13 +586,13 @@ server_init(struct server *server)
* | output->layer_tree[0] | background layer surfaces (e.g. swaybg)
*/
server->workspace_tree = wlr_scene_tree_create(&server->scene->tree);
server->xdg_popup_tree = wlr_scene_tree_create(&server->scene->tree);
server->workspace_tree = lab_wlr_scene_tree_create(&server->scene->tree);
server->xdg_popup_tree = lab_wlr_scene_tree_create(&server->scene->tree);
#if HAVE_XWAYLAND
server->unmanaged_tree = wlr_scene_tree_create(&server->scene->tree);
server->unmanaged_tree = lab_wlr_scene_tree_create(&server->scene->tree);
#endif
server->menu_tree = wlr_scene_tree_create(&server->scene->tree);
server->cycle_preview_tree = wlr_scene_tree_create(&server->scene->tree);
server->menu_tree = lab_wlr_scene_tree_create(&server->scene->tree);
server->cycle_preview_tree = lab_wlr_scene_tree_create(&server->scene->tree);
workspaces_init(server);