[PATCH v4 2/3] Bluetooth: Fix possible NULL dereference

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This patch adds NULL check for hci uart ldisc driver because some of
hci uart drivers allow hci_uart_tty_receive function could be called
though hci uart driver is not registered properly.

Signed-off-by: Chan-yeol Park <chanyeol.park@xxxxxxxxxxx>
---
 drivers/bluetooth/hci_ldisc.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index ed0fade..d710d8b 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -388,7 +388,10 @@ static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, char *f
 
 	spin_lock(&hu->rx_lock);
 	hu->proto->recv(hu, (void *) data, count);
-	hu->hdev->stat.byte_rx += count;
+
+	if (hu->hdev)
+		hu->hdev->stat.byte_rx += count;
+
 	spin_unlock(&hu->rx_lock);
 
 	tty_unthrottle(tty);
-- 
1.7.10.4

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