Patch "Bluetooth: hci_intel: add missing tty-device sanity check" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

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

    Bluetooth: hci_intel: add missing tty-device sanity check

to the 4.9-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_intel-add-missing-tty-device-sanity-check.patch
and it can be found in the queue-4.9 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 dcb9cfaa5ea9aa0ec08aeb92582ccfe3e4c719a9 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Wed, 29 Mar 2017 18:15:28 +0200
Subject: Bluetooth: hci_intel: add missing tty-device sanity check

From: Johan Hovold <johan@kernel.org>

commit dcb9cfaa5ea9aa0ec08aeb92582ccfe3e4c719a9 upstream.

Make sure to check the tty-device pointer before looking up the sibling
platform device to avoid dereferencing a NULL-pointer when the tty is
one end of a Unix98 pty.

Fixes: 74cdad37cd24 ("Bluetooth: hci_intel: Add runtime PM support")
Fixes: 1ab1f239bf17 ("Bluetooth: hci_intel: Add support for platform driver")
Cc: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/bluetooth/hci_intel.c |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

--- a/drivers/bluetooth/hci_intel.c
+++ b/drivers/bluetooth/hci_intel.c
@@ -307,6 +307,9 @@ static int intel_set_power(struct hci_ua
 	struct list_head *p;
 	int err = -ENODEV;
 
+	if (!hu->tty->dev)
+		return err;
+
 	mutex_lock(&intel_device_list_lock);
 
 	list_for_each(p, &intel_device_list) {
@@ -379,6 +382,9 @@ static void intel_busy_work(struct work_
 	struct intel_data *intel = container_of(work, struct intel_data,
 						busy_work);
 
+	if (!intel->hu->tty->dev)
+		return;
+
 	/* Link is busy, delay the suspend */
 	mutex_lock(&intel_device_list_lock);
 	list_for_each(p, &intel_device_list) {
@@ -889,6 +895,8 @@ done:
 	list_for_each(p, &intel_device_list) {
 		struct intel_device *dev = list_entry(p, struct intel_device,
 						      list);
+		if (!hu->tty->dev)
+			break;
 		if (hu->tty->dev->parent == dev->pdev->dev.parent) {
 			if (device_may_wakeup(&dev->pdev->dev)) {
 				set_bit(STATE_LPM_ENABLED, &intel->flags);
@@ -1056,6 +1064,9 @@ static int intel_enqueue(struct hci_uart
 
 	BT_DBG("hu %p skb %p", hu, skb);
 
+	if (!hu->tty->dev)
+		goto out_enqueue;
+
 	/* Be sure our controller is resumed and potential LPM transaction
 	 * completed before enqueuing any packet.
 	 */
@@ -1072,7 +1083,7 @@ static int intel_enqueue(struct hci_uart
 		}
 	}
 	mutex_unlock(&intel_device_list_lock);
-
+out_enqueue:
 	skb_queue_tail(&intel->txq, skb);
 
 	return 0;


Patches currently in stable-queue which might be from johan@kernel.org are

queue-4.9/usb-serial-ftdi_sio-add-device-id-for-microsemi-arrow-sf2plus-dev-kit.patch
queue-4.9/bluetooth-hci_bcm-add-missing-tty-device-sanity-check.patch
queue-4.9/bluetooth-hci_intel-add-missing-tty-device-sanity-check.patch
queue-4.9/serial-omap-fix-runtime-pm-handling-on-unbind.patch
queue-4.9/serial-omap-suspend-device-on-probe-errors.patch
queue-4.9/staging-gdm724x-gdm_mux-fix-use-after-free-on-module-unload.patch