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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Matias Karhumaa <matias.karhumaa@gmail.com>,
        Marcel Holtmann <marcel@holtmann.org>,
        Linus Torvalds <torvalds@linux-foundation.org>
Subject: [PATCH 4.9 065/102] Bluetooth: Fix faulty expression for minimum encryption key size check
Date:   Mon,  8 Jul 2019 17:12:58 +0200
Message-Id: <20190708150529.818384971@linuxfoundation.org>
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From: Matias Karhumaa <matias.karhumaa@gmail.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@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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
@@ -1352,7 +1352,7 @@ static bool l2cap_check_enc_key_size(str
 	 * actually encrypted before enforcing a key size.
 	 */
 	return (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags) ||
-		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)