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: d5bb334 ("Bluetooth: Align minimum encryption key size for LE and BR/EDR connections") Signed-off-by: Marcel Holtmann <[email protected]> Cc: [email protected]
raspberrypi · May 24, 2019 · 00de9e4 · 00de9e4
1 parent b45a32b
commit 00de9e4
Showing 1 changed file with 7 additions and 2 deletions.
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
@@ -1272,8 +1272,13 @@ int hci_conn_check_link_mode(struct hci_conn *conn)
 			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;
 
 	/* The minimum encryption key size needs to be enforced by the