Bluetooth: Restrict loading of link keys to BR/EDR capable controllers

Loading link keys into a LE only controller make no sense. The kernel
would never use any of these keys. So instead of allowing userspace
to waste memory, reject such operation with a not supported error
message.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

net/bluetooth/mgmt.c

@@ -1825,6 +1825,12 @@ static int load_link_keys(struct sock *sk, struct hci_dev *hdev, void *data,
 	u16 key_count, expected_len;
 	int i;
 
+	BT_DBG("request for %s", hdev->name);
+
+	if (!lmp_bredr_capable(hdev))
+		return cmd_status(sk, hdev->id, MGMT_OP_LOAD_LINK_KEYS,
+				  MGMT_STATUS_NOT_SUPPORTED);
+
 	key_count = __le16_to_cpu(cp->key_count);
 
 	expected_len = sizeof(*cp) + key_count *