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desktop-shell: detect stale shell surface outputs 

When displays are hot (un)plugged, it may happen that
a shell surface is left with a stale pointer to an output
that has already been freed. Add an output destroy listener
to catch such situations and set the output pointer to NULL.

Signed-off-by: Semi Malinen <semi.malinen@ge.com>
Signed-off-by: Fabien Lahoudere <fabien.lahoudere@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
This commit is contained in:
Semi Malinen 2018-05-02 11:10:32 +02:00 committed by Pekka Paalanen
parent e7a52fbb7d
commit 99f8c08559
1 changed files with 27 additions and 2 deletions
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29
desktop-shell/shell.c
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@ -128,6 +128,7 @@ struct shell_surface {
struct weston_output *fullscreen_output;
struct weston_output *output;
struct wl_listener output_destroy_listener;
struct surface_state {
bool fullscreen;
@ -1933,6 +1934,17 @@ shell_surface_update_layer(struct shell_surface *shsurf)
shell_surface_update_child_surface_layers(shsurf);
}
static void
notify_output_destroy(struct wl_listener *listener, void *data)
{
struct shell_surface *shsurf =
container_of(listener,
struct shell_surface, output_destroy_listener);
shsurf->output = NULL;
shsurf->output_destroy_listener.notify = NULL;
}
static void
shell_surface_set_output(struct shell_surface *shsurf,
struct weston_output *output)
@ -1948,6 +1960,18 @@ shell_surface_set_output(struct shell_surface *shsurf,
shsurf->output = es->output;
else
shsurf->output = get_default_output(es->compositor);
if (shsurf->output_destroy_listener.notify) {
wl_list_remove(&shsurf->output_destroy_listener.link);
shsurf->output_destroy_listener.notify = NULL;
}
if (!shsurf->output)
return;
shsurf->output_destroy_listener.notify = notify_output_destroy;
wl_signal_add(&shsurf->output->destroy_signal,
&shsurf->output_destroy_listener);
}
static void
@ -1986,7 +2010,7 @@ unset_maximized(struct shell_surface *shsurf)
weston_desktop_surface_get_surface(shsurf->desktop_surface);
/* undo all maximized things here */
shsurf->output = get_default_output(surface->compositor);
shell_surface_set_output(shsurf, get_default_output(surface->compositor));
if (shsurf->saved_position_valid)
weston_view_set_position(shsurf->view,
@ -2348,7 +2372,8 @@ desktop_surface_added(struct weston_desktop_surface *desktop_surface,
shsurf->fullscreen.black_view = NULL;
wl_list_init(&shsurf->fullscreen.transform.link);
shsurf->output = get_default_output(shsurf->shell->compositor);
shell_surface_set_output(
shsurf, get_default_output(shsurf->shell->compositor));
wl_signal_init(&shsurf->destroy_signal);