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scene/subsurface_tree: fix handling subsurface destruction

Browse source 
This commit renames map/unmap listeners to clarify that they handle
subsurface events, and ensures the node is always destroyed before
the subsurface.

Without this patch, wl_list_remove() would operate on listener links in
already freed memory. glibc is usually lenient to bugs like this, but
musl isn't.
This commit is contained in:
Kirill Primak 2022-01-01 14:04:53 +03:00 committed by Simon Ser
parent 59b9518f07
commit 83ab5055fd
1 changed files with 39 additions and 26 deletions
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65
types/scene/subsurface_tree.c
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@ -13,15 +13,20 @@ struct wlr_scene_subsurface_tree {
struct wlr_surface *surface;
struct wlr_scene_surface *scene_surface;
struct wlr_scene_subsurface_tree *parent; // NULL for the top-level surface
struct wlr_addon surface_addon; // only set if there's a parent
struct wl_listener tree_destroy;
struct wl_listener surface_destroy;
struct wl_listener surface_commit;
struct wl_listener surface_map;
struct wl_listener surface_unmap;
struct wl_listener surface_new_subsurface;
struct wlr_scene_subsurface_tree *parent; // NULL for the top-level surface
// Only valid if the surface is a sub-surface
struct wlr_addon surface_addon;
struct wl_listener subsurface_destroy;
struct wl_listener subsurface_map;
struct wl_listener subsurface_unmap;
};
static void subsurface_tree_handle_tree_destroy(struct wl_listener *listener,
@ -31,23 +36,17 @@ static void subsurface_tree_handle_tree_destroy(struct wl_listener *listener,
// tree and scene_surface will be cleaned up by scene_node_finish
if (subsurface_tree->parent) {
wlr_addon_finish(&subsurface_tree->surface_addon);
wl_list_remove(&subsurface_tree->subsurface_destroy.link);
wl_list_remove(&subsurface_tree->subsurface_map.link);
wl_list_remove(&subsurface_tree->subsurface_unmap.link);
}
wl_list_remove(&subsurface_tree->tree_destroy.link);
wl_list_remove(&subsurface_tree->surface_destroy.link);
wl_list_remove(&subsurface_tree->surface_commit.link);
wl_list_remove(&subsurface_tree->surface_map.link);
wl_list_remove(&subsurface_tree->surface_unmap.link);
wl_list_remove(&subsurface_tree->surface_new_subsurface.link);
free(subsurface_tree);
}
static void subsurface_tree_handle_surface_destroy(struct wl_listener *listener,
void *data) {
struct wlr_scene_subsurface_tree *subsurface_tree =
wl_container_of(listener, subsurface_tree, surface_destroy);
wlr_scene_node_destroy(&subsurface_tree->tree->node);
}
static const struct wlr_addon_interface subsurface_tree_addon_impl;
static struct wlr_scene_subsurface_tree *subsurface_tree_from_subsurface(
@ -97,6 +96,13 @@ static void subsurface_tree_reconfigure(
}
}
static void subsurface_tree_handle_surface_destroy(struct wl_listener *listener,
void *data) {
struct wlr_scene_subsurface_tree *subsurface_tree =
wl_container_of(listener, subsurface_tree, surface_destroy);
wlr_scene_node_destroy(&subsurface_tree->tree->node);
}
static void subsurface_tree_handle_surface_commit(struct wl_listener *listener,
void *data) {
struct wlr_scene_subsurface_tree *subsurface_tree =
@ -106,18 +112,25 @@ static void subsurface_tree_handle_surface_commit(struct wl_listener *listener,
subsurface_tree_reconfigure(subsurface_tree);
}
static void subsurface_tree_handle_surface_map(struct wl_listener *listener,
static void subsurface_tree_handle_subsurface_destroy(struct wl_listener *listener,
void *data) {
struct wlr_scene_subsurface_tree *subsurface_tree =
wl_container_of(listener, subsurface_tree, surface_map);
wl_container_of(listener, subsurface_tree, subsurface_destroy);
wlr_scene_node_destroy(&subsurface_tree->tree->node);
}
static void subsurface_tree_handle_subsurface_map(struct wl_listener *listener,
void *data) {
struct wlr_scene_subsurface_tree *subsurface_tree =
wl_container_of(listener, subsurface_tree, subsurface_map);
wlr_scene_node_set_enabled(&subsurface_tree->tree->node, true);
}
static void subsurface_tree_handle_surface_unmap(struct wl_listener *listener,
static void subsurface_tree_handle_subsurface_unmap(struct wl_listener *listener,
void *data) {
struct wlr_scene_subsurface_tree *subsurface_tree =
wl_container_of(listener, subsurface_tree, surface_unmap);
wl_container_of(listener, subsurface_tree, subsurface_unmap);
wlr_scene_node_set_enabled(&subsurface_tree->tree->node, false);
}
@ -151,8 +164,14 @@ static bool subsurface_tree_create_subsurface(
wlr_addon_init(&child->surface_addon, &subsurface->surface->addons,
parent, &subsurface_tree_addon_impl);
wl_signal_add(&subsurface->events.map, &child->surface_map);
wl_signal_add(&subsurface->events.unmap, &child->surface_unmap);
child->subsurface_destroy.notify = subsurface_tree_handle_subsurface_destroy;
wl_signal_add(&subsurface->events.destroy, &child->subsurface_destroy);
child->subsurface_map.notify = subsurface_tree_handle_subsurface_map;
wl_signal_add(&subsurface->events.map, &child->subsurface_map);
child->subsurface_unmap.notify = subsurface_tree_handle_subsurface_unmap;
wl_signal_add(&subsurface->events.unmap, &child->subsurface_unmap);
return true;
}
@ -214,12 +233,6 @@ static struct wlr_scene_subsurface_tree *scene_surface_tree_create(
subsurface_tree->surface_commit.notify = subsurface_tree_handle_surface_commit;
wl_signal_add(&surface->events.commit, &subsurface_tree->surface_commit);
subsurface_tree->surface_map.notify = subsurface_tree_handle_surface_map;
wl_list_init(&subsurface_tree->surface_map.link);
subsurface_tree->surface_unmap.notify = subsurface_tree_handle_surface_unmap;
wl_list_init(&subsurface_tree->surface_unmap.link);
subsurface_tree->surface_new_subsurface.notify =
subsurface_tree_handle_surface_new_subsurface;
wl_signal_add(&surface->events.new_subsurface,