linux-kernel - [PATCH 3.2 088/125] Bluetooth: Fix check for connection encryption

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Message-ID: <lsq.1404846110.136906955@decadent.org.uk>
Date:	Tue, 08 Jul 2014 20:01:50 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Marcel Holtmann" <marcel@...tmann.org>,
	"Johan Hedberg" <johan.hedberg@...el.com>
Subject: [PATCH 3.2 088/125] Bluetooth: Fix check for connection encryption

3.2.61-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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

commit e694788d73efe139b24f78b036deb97fe57fa8cb upstream.

The conn->link_key variable tracks the type of link key in use. It is
set whenever we respond to a link key request as well as when we get a
link key notification event.

These two events do not however always guarantee that encryption is
enabled: getting a link key request and responding to it may only mean
that the remote side has requested authentication but not encryption. On
the other hand, the encrypt change event is a certain guarantee that
encryption is enabled. The real encryption state is already tracked in
the conn->link_mode variable through the HCI_LM_ENCRYPT bit.

This patch fixes a check for encryption in the hci_conn_auth function to
use the proper conn->link_mode value and thereby eliminates the chance
of a false positive result.

Signed-off-by: Johan Hedberg <johan.hedberg@...el.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/bluetooth/hci_conn.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -617,7 +617,7 @@ static int hci_conn_auth(struct hci_conn
 		/* If we're already encrypted set the REAUTH_PEND flag,
 		 * otherwise set the ENCRYPT_PEND.
 		 */
-		if (conn->key_type != 0xff)
+		if (conn->link_mode & HCI_LM_ENCRYPT)
 			set_bit(HCI_CONN_REAUTH_PEND, &conn->pend);
 		else
 			set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend);

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