Patch "Bluetooth: Fix potential NULL dereference" has been added to the 3.18-stable tree

Patch "Bluetooth: Fix potential NULL dereference" has been added to the 3.18-stable tree

[gregkh]

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

    Bluetooth: Fix potential NULL dereference

to the 3.18-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-fix-potential-null-dereference.patch
and it can be found in the queue-3.18 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 88d9077c27d0c1a7c022d9dc987640beecf23560 Mon Sep 17 00:00:00 2001
From: Johan Hedberg <johan.hedberg@intel.com>
Date: Tue, 3 Feb 2015 10:01:13 +0200
Subject: Bluetooth: Fix potential NULL dereference

From: Johan Hedberg <johan.hedberg@intel.com>

commit 88d9077c27d0c1a7c022d9dc987640beecf23560 upstream.

The bnep_get_device function may be triggered by an ioctl just after a
connection has gone down. In such a case the respective L2CAP chan->conn
pointer will get set to NULL (by l2cap_chan_del). This patch adds a
missing NULL check for this case in the bnep_get_device() function.

Reported-by: Patrik Flykt <patrik.flykt@linux.intel.com>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/bluetooth/bnep/core.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/net/bluetooth/bnep/core.c
+++ b/net/bluetooth/bnep/core.c
@@ -511,13 +511,12 @@ static int bnep_session(void *arg)
 
 static struct device *bnep_get_device(struct bnep_session *session)
 {
-	struct hci_conn *conn;
+	struct l2cap_conn *conn = l2cap_pi(session->sock->sk)->chan->conn;
 
-	conn = l2cap_pi(session->sock->sk)->chan->conn->hcon;
-	if (!conn)
+	if (!conn || !conn->hcon)
 		return NULL;
 
-	return &conn->dev;
+	return &conn->hcon->dev;
 }
 
 static struct device_type bnep_type = {


Patches currently in stable-queue which might be from johan.hedberg@intel.com are

queue-3.18/bluetooth-fix-potential-null-dereference.patch