Bluetooth: Fix index added after unregister

When a userchannel socket is released, we should check whether the hdev
is already unregistered before sending out an IndexAdded.
Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/hci_sock.c

@@ -869,7 +869,8 @@ static int hci_sock_release(struct socket *sock)
 
 	hdev = hci_pi(sk)->hdev;
 	if (hdev) {
-		if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
+		if (hci_pi(sk)->channel == HCI_CHANNEL_USER &&
+		    !hci_dev_test_flag(hdev, HCI_UNREGISTER)) {
 			/* When releasing a user channel exclusive access,
 			 * call hci_dev_do_close directly instead of calling
 			 * hci_dev_close to ensure the exclusive access will
@@ -878,6 +879,11 @@ static int hci_sock_release(struct socket *sock)
 			 * The checking of HCI_AUTO_OFF is not needed in this
 			 * case since it will have been cleared already when
 			 * opening the user channel.
+			 *
+			 * Make sure to also check that we haven't already
+			 * unregistered since all the cleanup will have already
+			 * been complete and hdev will get released when we put
+			 * below.
 			 */
 			hci_dev_do_close(hdev);
 			hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);