linux-kernel - [PATCH AUTOSEL for 4.14 30/60] Bluetooth: hci_uart_set_flow_control: Fix NULL deref when using serdev

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Date:   Wed, 13 Dec 2017 01:55:18 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.14 30/60] Bluetooth: hci_uart_set_flow_control:
 Fix NULL deref when using serdev

From: Hans de Goede <hdegoede@...hat.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@...hat.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/bluetooth/hci_ldisc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index a746627e784e..eec95019f15c 100644
--- 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 hci_uart *hu, bool enable)
 	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;
-- 
2.11.0