Bluetooth: hci_ldisc: Add missing clear HCI_UART_PROTO_READY

Ensure that HCI_UART_PROTO_READY is cleared before close(hu) is
called which closes the Data Link protocol layer.

Therefore, add the missing bit clear of HCI_UART_PROTO_READY to
hci_uart_init_work() so that the flag is cleared when
hci_register_dev fails.

Without the fix, the functions of the Data Link protocol layer could
potentially be accessed after that layer has been closed. This
could lead to a crash as memory would have been freed in that layer.
Signed-off-by: Dean Jenkins <Dean_Jenkins@mentor.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/hci_ldisc.c

@@ -188,6 +188,7 @@ static void hci_uart_init_work(struct work_struct *work)
 		hdev = hu->hdev;
 		hu->hdev = NULL;
 		hci_free_dev(hdev);
+		clear_bit(HCI_UART_PROTO_READY, &hu->flags);
 		hu->proto->close(hu);
 		return;
 	}