linux-kernel - [PATCH 3.16 056/132] Bluetooth: Fix faulty expression for minimum encryption key size check

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Message-ID: <lsq.1568989415.460058078@decadent.org.uk>
Date:   Fri, 20 Sep 2019 15:23:35 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Matias Karhumaa" <matias.karhumaa@...il.com>,
        "Marcel Holtmann" <marcel@...tmann.org>
Subject: [PATCH 3.16 056/132] Bluetooth: Fix faulty expression for minimum
 encryption key size check

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

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

From: Matias Karhumaa <matias.karhumaa@...il.com>

commit eca94432934fe5f141d084f2e36ee2c0e614cc04 upstream.

Fix minimum encryption key size check so that HCI_MIN_ENC_KEY_SIZE is
also allowed as stated in the comment.

This bug caused connection problems with devices having maximum
encryption key size of 7 octets (56-bit).

Fixes: 693cd8ce3f88 ("Bluetooth: Fix regression with minimum encryption key size alignment")
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=203997
Signed-off-by: Matias Karhumaa <matias.karhumaa@...il.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/bluetooth/l2cap_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -1272,7 +1272,7 @@ static bool l2cap_check_enc_key_size(str
 	 * actually encrypted before enforcing a key size.
 	 */
 	return (!(hcon->link_mode & HCI_LM_ENCRYPT) ||
-		hcon->enc_key_size > HCI_MIN_ENC_KEY_SIZE);
+		hcon->enc_key_size >= HCI_MIN_ENC_KEY_SIZE);
 }
 
 static void l2cap_do_start(struct l2cap_chan *chan)