Patch "Bluetooth: hci_uart_set_flow_control: Fix NULL deref when using serdev" has been added to the 4.14-stable tree

Patch "Bluetooth: hci_uart_set_flow_control: Fix NULL deref when using serdev" has been added to the 4.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    Bluetooth: hci_uart_set_flow_control: Fix NULL deref when using serdev

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     bluetooth-hci_uart_set_flow_control-fix-null-deref-when-using-serdev.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Wed Dec 20 18:17:52 CET 2017
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 4 Oct 2017 20:43:35 +0200
Subject: Bluetooth: hci_uart_set_flow_control: Fix NULL deref when using serdev

From: Hans de Goede <hdegoede@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 <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@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;


Patches currently in stable-queue which might be from hdegoede@redhat.com are

queue-4.14/bluetooth-hci_uart_set_flow_control-fix-null-deref-when-using-serdev.patch
queue-4.14/bluetooth-hci_bcm-fix-setting-of-irq-trigger-type.patch