linux-kernel - [PATCH 3.15 133/139] Bluetooth: Fix properly ignoring LTKs of unknown types

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Date:	Sat, 28 Jun 2014 10:48:14 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Johan Hedberg <johan.hedberg@...el.com>,
	Marcel Holtmann <marcel@...tmann.org>
Subject: [PATCH 3.15 133/139] Bluetooth: Fix properly ignoring LTKs of unknown types

3.15-stable review patch.  If anyone has any objections, please let me know.

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

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

commit 61b433579b6ffecb1d3534fd482dcd48535277c8 upstream.

In case there are new LTK types in the future we shouldn't just blindly
assume that != MGMT_LTK_UNAUTHENTICATED means that the key is
authenticated. This patch adds explicit checks for each allowed key type
in the form of a switch statement and skips any key which has an unknown
value.

Signed-off-by: Johan Hedberg <johan.hedberg@...el.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/bluetooth/mgmt.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -4542,10 +4542,16 @@ static int load_long_term_keys(struct so
 		else
 			type = HCI_SMP_LTK_SLAVE;
 
-		if (key->type == MGMT_LTK_UNAUTHENTICATED)
+		switch (key->type) {
+		case MGMT_LTK_UNAUTHENTICATED:
 			authenticated = 0x00;
-		else
+			break;
+		case MGMT_LTK_AUTHENTICATED:
 			authenticated = 0x01;
+			break;
+		default:
+			continue;
+		}
 
 		hci_add_ltk(hdev, &key->addr.bdaddr, addr_type, type,
 			    authenticated, key->val, key->enc_size, key->ediv,


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