[PATCH 4.14 125/159] Bluetooth: hci_uart_set_flow_control: Fix NULL deref when using serdev

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hans de Goede <hdego...@redhat.com>


[ Upstream commit 7841d554809b518a22349e7e39b6b63f8a48d0fb ]

Fix a NULL pointer deref (hu->tty) when calling hci_uart_set_flow_control
on hci_uart-s using serdev.

Signed-off-by: Hans de Goede <hdego...@redhat.com>
Signed-off-by: Marcel Holtmann <mar...@holtmann.org>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/bluetooth/hci_ldisc.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -41,6 +41,7 @@
 #include <linux/ioctl.h>
 #include <linux/skbuff.h>
 #include <linux/firmware.h>
+#include <linux/serdev.h>
 
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
@@ -298,6 +299,12 @@ void hci_uart_set_flow_control(struct hc
        unsigned int set = 0;
        unsigned int clear = 0;
 
+       if (hu->serdev) {
+               serdev_device_set_flow_control(hu->serdev, !enable);
+               serdev_device_set_rts(hu->serdev, !enable);
+               return;
+       }
+
        if (enable) {
                /* Disable hardware flow control */
                ktermios = tty->termios;