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Fix possible crash in server-decoration when surface destroyed
If the underlying surface is destroyed, but the client has not yet destroyed the server decoration object, and then tries to call request_mode() on it, the compositor will crash, because the wlr_server_decoration struct has been freed, and the wl_resource's user_data member has been NULLed out. Yes, this is certainly an error for the client to do that, but I shouldn't be able to write a buggy (or malicious) Wayland app that can take down the entire compositor.
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@ -24,7 +24,7 @@ static void server_decoration_handle_request_mode(struct wl_client *client,
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struct wl_resource *resource, uint32_t mode) {
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struct wlr_server_decoration *decoration =
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decoration_from_resource(resource);
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if (decoration->mode == mode) {
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if (decoration == NULL || decoration->mode == mode) {
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return;
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}
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decoration->mode = mode;
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