linux-kernel - [PATCH 3.2 31/92] Bluetooth: Fix redundant encryption request for reauthentication

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Message-ID: <lsq.1402104389.634839395@decadent.org.uk>
Date:	Sat, 07 Jun 2014 02:26:29 +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 31/92] Bluetooth: Fix redundant encryption request for
 reauthentication

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

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

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

commit 09da1f3463eb81d59685df723b1c5950b7570340 upstream.

When we're performing reauthentication (in order to elevate the
security level from an unauthenticated key to an authenticated one) we
do not need to issue any encryption command once authentication
completes. Since the trigger for the encryption HCI command is the
ENCRYPT_PEND flag this flag should not be set in this scenario.
Instead, the REAUTH_PEND flag takes care of all necessary steps for
reauthentication.

Signed-off-by: Johan Hedberg <johan.hedberg@...el.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
[bwh: Backported to 3.2:
 - Adjust context
 - s/conn->flags/conn->pend/]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/bluetooth/hci_conn.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -610,14 +610,17 @@ static int hci_conn_auth(struct hci_conn
 	if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 		struct hci_cp_auth_requested cp;
 
-		/* encrypt must be pending if auth is also pending */
-		set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend);
-
 		cp.handle = cpu_to_le16(conn->handle);
 		hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
 							sizeof(cp), &cp);
+
+		/* If we're already encrypted set the REAUTH_PEND flag,
+		 * otherwise set the ENCRYPT_PEND.
+		 */
 		if (conn->key_type != 0xff)
 			set_bit(HCI_CONN_REAUTH_PEND, &conn->pend);
+		else
+			set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend);
 	}
 
 	return 0;

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