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

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

[gregkh]

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

    Bluetooth: hci_bcm: 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_bcm-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 95065a61e9bf25fb85295127fba893200c2bbbd8 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Wed, 29 Mar 2017 18:15:27 +0200
Subject: Bluetooth: hci_bcm: add missing tty-device sanity check

From: Johan Hovold <johan@kernel.org>

commit 95065a61e9bf25fb85295127fba893200c2bbbd8 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: 0395ffc1ee05 ("Bluetooth: hci_bcm: Add PM for BCM devices")
Cc: Frederic Danis <frederic.danis@linux.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_bcm.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -287,6 +287,9 @@ static int bcm_open(struct hci_uart *hu)
 
 	hu->priv = bcm;
 
+	if (!hu->tty->dev)
+		goto out;
+
 	mutex_lock(&bcm_device_lock);
 	list_for_each(p, &bcm_device_list) {
 		struct bcm_device *dev = list_entry(p, struct bcm_device, list);
@@ -307,7 +310,7 @@ static int bcm_open(struct hci_uart *hu)
 	}
 
 	mutex_unlock(&bcm_device_lock);
-
+out:
 	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