From babdd6ccf757f18ef15b50d9f16c55031a7c1944 Mon Sep 17 00:00:00 2001 From: emersion Date: Tue, 30 Jan 2018 19:45:57 +0100 Subject: backend: fix use-after-free when destroying backends 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. --- backend/headless/backend.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'backend/headless/backend.c') diff --git a/backend/headless/backend.c b/backend/headless/backend.c index 61409d41..0bf5ec28 100644 --- a/backend/headless/backend.c +++ b/backend/headless/backend.c @@ -51,6 +51,8 @@ static void backend_destroy(struct wlr_backend *wlr_backend) { wlr_input_device_destroy(&input_device->wlr_input_device); } + wl_signal_emit(&wlr_backend->events.destroy, backend); + wlr_egl_finish(&backend->egl); free(backend); } -- cgit v1.2.3