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From 6dec9b770df1f986091eb4e61e829f2d8b2031b1 Mon Sep 17 00:00:00 2001
From: Marcel Holtmann <marcel@holtmann.org>
Date: Wed, 22 May 2019 09:05:40 +0200
Subject: [PATCH 500/725] Bluetooth: Check key sizes only when Secure Simple
Pairing is enabled
The encryption is only mandatory to be enforced when both sides are using
Secure Simple Pairing and this means the key size check makes only sense
in that case.
On legacy Bluetooth 2.0 and earlier devices like mice the encryption was
optional and thus causing an issue if the key size check is not bound to
using Secure Simple Pairing.
Fixes: d5bb334a8e17 ("Bluetooth: Align minimum encryption key size for LE and BR/EDR connections")
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org
---
net/bluetooth/hci_conn.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -1272,8 +1272,13 @@ int hci_conn_check_link_mode(struct hci_
return 0;
}
- if (hci_conn_ssp_enabled(conn) &&
- !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
+ /* If Secure Simple Pairing is not enabled, then legacy connection
+ * setup is used and no encryption or key sizes can be enforced.
+ */
+ if (!hci_conn_ssp_enabled(conn))
+ return 1;
+
+ if (!test_bit(HCI_CONN_ENCRYPT, &conn->flags))
return 0;
return 1;
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