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backend: fix use-after-free when destroying backends

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The backend destroy signal is emitted before the output_remove
signal is. When the destroy signal is emitted listeners remove
their output_remove listener, so the output_remove signal is never
received and listeners have an invalid output pointer.

The correct way to solve this would be to remove the output_remove
signal completely and use the wlr_output.events.destroy signal
instead. This isn't yet possible because wl_signal_emit is unsafe
and listeners cannot be removed in listeners.
This commit is contained in:
emersion 2018-01-30 19:45:57 +01:00
parent 704130cc11
commit babdd6ccf7
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10 changed files with 27 additions and 13 deletions
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backend/x11/backend.c
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@ -259,6 +259,8 @@ static void wlr_x11_backend_destroy(struct wlr_backend *backend) {
xkb_state_unref(x11->keyboard_dev.keyboard->xkb_state);
}
wl_signal_emit(&backend->events.destroy, backend);
wl_list_remove(&x11->display_destroy.link);
wl_event_source_remove(x11->frame_timer);