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Date:   Thu, 20 Jun 2019 19:56:36 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vasily Khoruzhick <anarsoul@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Jeremy Cline <jeremy@...ine.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...el.com>
Subject: [PATCH 4.4 39/84] Revert "Bluetooth: Align minimum encryption key size for LE and BR/EDR connections"

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

This reverts commit d016dc1bd29a2cfb0707fc6fb290ccd21f3b139c which is
commit d5bb334a8e171b262e48f378bd2096c0ea458265 upstream.

Lots of people have reported issues with this patch, and as there does
not seem to be a fix going into Linus's kernel tree any time soon,
revert the commit in the stable trees so as to get people's machines
working properly again.

Reported-by: Vasily Khoruzhick <anarsoul@...il.com>
Reported-by: Hans de Goede <hdegoede@...hat.com>
Cc: Jeremy Cline <jeremy@...ine.org>
Cc: Marcel Holtmann <marcel@...tmann.org>
Cc: Johan Hedberg <johan.hedberg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/net/bluetooth/hci_core.h |    3 ---
 net/bluetooth/hci_conn.c         |    8 --------
 2 files changed, 11 deletions(-)

--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -174,9 +174,6 @@ struct adv_info {
 
 #define HCI_MAX_SHORT_NAME_LENGTH	10
 
-/* Min encryption key size to match with SMP */
-#define HCI_MIN_ENC_KEY_SIZE		7
-
 /* Default LE RPA expiry time, 15 minutes */
 #define HCI_DEFAULT_RPA_TIMEOUT		(15 * 60)
 
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -1177,14 +1177,6 @@ int hci_conn_check_link_mode(struct hci_
 	    !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
 		return 0;
 
-	/* The minimum encryption key size needs to be enforced by the
-	 * host stack before establishing any L2CAP connections. The
-	 * specification in theory allows a minimum of 1, but to align
-	 * BR/EDR and LE transports, a minimum of 7 is chosen.
-	 */
-	if (conn->enc_key_size < HCI_MIN_ENC_KEY_SIZE)
-		return 0;
-
 	return 1;
 }
 


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