Bluetooth: Fix check for connection encryption

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@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 4d99d42f30ffa9a7cc325758492ccb6977f4634a..f456645806712d6be994aa216ff001f6bee39666 100644 (file)
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -617,7 +617,7 @@ static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
                /* 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);