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src/debug.c: reset last_view

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Before this patch following would cause a use-after-free:
- calling the Debug action when there was at least one view around
- closing that view
- calling the Debug action again

Also add a label for the layer popup tree.
This commit is contained in:
Consolatis 2023-01-02 22:40:17 +01:00 • committed by Johan Malm
parent bc65357267
commit 8bde7bcee0
1 changed files with 18 additions and 9 deletions
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27
src/debug.c
View file

@ -14,6 +14,8 @@
#define IGNORE_MENU true
#define LEFT_COL_SPACE 35
static struct view *last_view;
static const char *
get_node_type(struct wlr_scene_node *node)
{
@ -67,8 +69,7 @@ get_view_part(struct view *view, struct wlr_scene_node *node)
}
static const char *
get_special(struct server *server, struct wlr_scene_node *node,
struct view **last_view)
get_special(struct server *server, struct wlr_scene_node *node)
{
if (node == &server->scene->tree.node) {
return "server->scene";
@ -92,6 +93,9 @@ get_special(struct server *server, struct wlr_scene_node *node,
if (node == &output->osd_tree->node) {
return "output->osd_tree";
}
if (node == &output->layer_popup_tree->node) {
return "output->popup_tree";
}
for (int i = 0; i < 4; i++) {
if (node == &output->layer_tree[i]->node) {
return get_layer_name(i);
@ -107,12 +111,12 @@ get_special(struct server *server, struct wlr_scene_node *node,
struct wlr_scene_tree *grand_parent =
node->parent ? node->parent->node.parent : NULL;
if (grand_parent == server->view_tree) {
*last_view = node_view_from_node(node);
last_view = node_view_from_node(node);
}
if (node->parent == server->view_tree_always_on_top) {
*last_view = node_view_from_node(node);
last_view = node_view_from_node(node);
}
const char *view_part = get_view_part(*last_view, node);
const char *view_part = get_view_part(last_view, node);
if (view_part) {
return view_part;
}
@ -138,8 +142,7 @@ static void
dump_tree(struct server *server, struct wlr_scene_node *node,
int pos, int x, int y)
{
static struct view *view;
const char *type = get_special(server, node, &view);
const char *type = get_special(server, node);
if (pos) {
printf("%*c+-- ", pos, ' ');
@ -158,8 +161,8 @@ dump_tree(struct server *server, struct wlr_scene_node *node,
printf("%s %*c %4d %4d [%p]\n", type, padding, ' ', x, y, node);
if ((IGNORE_MENU && node == &server->menu_tree->node)
|| (IGNORE_SSD && view
&& ssd_debug_is_root_node(view->ssd, node))) {
|| (IGNORE_SSD && last_view
&& ssd_debug_is_root_node(last_view->ssd, node))) {
printf("%*c%s\n", pos + 4 + INDENT_SIZE, ' ', "<skipping children>");
return;
}
@ -180,4 +183,10 @@ debug_dump_scene(struct server *server)
printf("\n");
dump_tree(server, &server->scene->tree.node, 0, 0, 0);
printf("\n");
/*
* Reset last_view so we don't access a
* potentially free'd pointer on the next call
*/
last_view = NULL;
}