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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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11
src/ssd/ssd-extents.c
View file

@ -2,6 +2,7 @@
#include <pixman.h>
#include <wlr/types/wlr_scene.h>
#include "common/scene-helpers.h"
#include "config/rcxml.h"
#include "labwc.h"
#include "output.h"
@ -17,7 +18,7 @@ ssd_extents_create(struct ssd *ssd)
int border_width = MAX(0, MAX(rc.resize_minimum_area, theme->border_width));
ssd->extents.tree = wlr_scene_tree_create(ssd->tree);
ssd->extents.tree = lab_wlr_scene_tree_create(ssd->tree);
struct wlr_scene_tree *parent = ssd->extents.tree;
if (view->fullscreen || view->maximized == VIEW_AXIS_BOTH) {
wlr_scene_node_set_enabled(&parent->node, false);
@ -26,10 +27,10 @@ ssd_extents_create(struct ssd *ssd)
-border_width, -(ssd->titlebar.height + border_width));
float invisible[4] = { 0.0f, 0.0f, 0.0f, 0.0f };
ssd->extents.top = wlr_scene_rect_create(parent, 0, 0, invisible);
ssd->extents.left = wlr_scene_rect_create(parent, 0, 0, invisible);
ssd->extents.right = wlr_scene_rect_create(parent, 0, 0, invisible);
ssd->extents.bottom = wlr_scene_rect_create(parent, 0, 0, invisible);
ssd->extents.top = lab_wlr_scene_rect_create(parent, 0, 0, invisible);
ssd->extents.left = lab_wlr_scene_rect_create(parent, 0, 0, invisible);
ssd->extents.right = lab_wlr_scene_rect_create(parent, 0, 0, invisible);
ssd->extents.bottom = lab_wlr_scene_rect_create(parent, 0, 0, invisible);
/* Initial manual update to keep X11 applications happy */
ssd_extents_update(ssd);