bluetooth: Check for NULL pointers in input args



There is a possibility that line discipline receives data before
variable proto is set which leads to kernel crash.
Check if proto is valid.

Change-Id: I09e4ca692ccef6dcc2f0acd78ce3847878d17188
Signed-off-by: Rupesh Tatiya <rtatiya@codeaurora.org>

parent 6e11466b

drivers/bluetooth/hci_ldisc.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -386,12 +386,15 @@ static void hci_uart_tty_receive(struct tty_struct tty, const u8 data, char *f
		{
		struct hci_uart hu = (void )tty->disc_data;

		if (!hu \|\| tty != hu->tty)
		if (!hu \|\| tty != hu->tty \|\| !data)
		return;

		if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
		return;

		if (!hu->proto)
		return;

		spin_lock(&hu->rx_lock);
		hu->proto->recv(hu, (void *) data, count);