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wayland: Add destruction listener to activation token surface

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In the timespan between an activation token being created and the
token being used by the activated application, the surface that started
the activation request may end up destroyed/disposed.

In that case, the token would be left with a stale surface pointer,
maybe causing crashes later on. Set up a destroy notification listener
so that we do know to unset the token surface if that situation arises,
this will result in Mutter not considering the token activatable, thus
maybe issuing the "Application needs attention" notification if the
activated surface did not immediately get focus. In any case this is
better than a compositor crash.

A typical situation where this may happen is "Open With..." dialogs,
since those don't live long after launching the application.

Fixes: https://gitlab.gnome.org/GNOME/mutter/-/issues/2390
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2592>
This commit is contained in:
Carlos Garnacho 2022-08-23 21:56:02 +02:00
parent 9c402bd091
commit ed516dde89
1 changed files with 15 additions and 0 deletions
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15
src/wayland/meta-wayland-activation.c
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@ -47,6 +47,7 @@ struct _MetaXdgActivationToken
MetaWaylandSeat *seat;
MetaWaylandActivation *activation;
MetaStartupSequence *sequence;
struct wl_listener surface_listener;
char *app_id;
char *token;
uint32_t serial;
@ -94,6 +95,8 @@ token_set_surface (struct wl_client *client,
MetaWaylandSurface *surface = wl_resource_get_user_data (surface_resource);
token->surface = surface;
wl_resource_add_destroy_listener (surface_resource,
&token->surface_listener);
}
static void
@ -216,6 +219,17 @@ meta_xdg_activation_token_free (MetaXdgActivationToken *token)
g_free (token);
}
static void
token_handle_surface_destroy (struct wl_listener *listener,
void *data)
{
MetaXdgActivationToken *token = wl_container_of (listener, token,
surface_listener);
token->surface = NULL;
wl_list_remove (&token->surface_listener.link);
}
static void
meta_wayland_activation_token_create_new_resource (MetaWaylandActivation *activation,
struct wl_client *client,
@ -237,6 +251,7 @@ meta_wayland_activation_token_create_new_resource (MetaWaylandActivation *activa
wl_resource_set_user_data (token_resource, token);
wl_list_insert (&activation->token_list,
wl_resource_get_link (token_resource));
token->surface_listener.notify = token_handle_surface_destroy;
}
static void