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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/backend.c
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@ -37,7 +37,6 @@ void wlr_backend_destroy(struct wlr_backend *backend) {
return;
}
wl_signal_emit(&backend->events.destroy, backend);
if (backend->impl && backend->impl->destroy) {
backend->impl->destroy(backend);
} else {