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[Bluetooth] Avoid NULL pointer dereference with tty->driver 

This patch checks for tty->driver before trying to call flush_buffer().

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Marcel Holtmann 2006-07-06 15:53:31 +02:00 committed by David S. Miller
parent 25ea6db04a
commit 420cc3505f
1 changed files with 2 additions and 2 deletions
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4
drivers/bluetooth/hci_ldisc.c
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@ -191,7 +191,7 @@ static int hci_uart_flush(struct hci_dev *hdev)
/* Flush any pending characters in the driver and discipline. */
tty_ldisc_flush(tty);
if (tty->driver->flush_buffer)
if (tty->driver && tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
@ -290,7 +290,7 @@ static int hci_uart_tty_open(struct tty_struct *tty)
if (tty->ldisc.flush_buffer)
tty->ldisc.flush_buffer(tty);
if (tty->driver->flush_buffer)
if (tty->driver && tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
return 0;