Bluetooth: add NULL pointer check in HCI

If we fail to find a hci device pointer in hci_uart, don't try
to deref the NULL one we do have.

Signed-off-by: Jun Nie <njun@marvell.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index 720148294e64..3c6cabcb7d84 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -311,8 +311,10 @@ static void hci_uart_tty_close(struct tty_struct *tty)
 
                 if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
                         hu->proto->close(hu);
-                        hci_unregister_dev(hdev);
-                        hci_free_dev(hdev);
+                        if (hdev) {
+                                hci_unregister_dev(hdev);
+                                hci_free_dev(hdev);
+                        }
                 }
         }
 }