Bluteooth: Reject SMP bonding if HCI_PAIRABLE is not set

If the remote device tries to initiate bonding with us and we don't have
HCI_PAIRABLE set we should just flat out reject the request. This brings
SMP in line with how the flag is used for BR/EDR SSP.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/smp.c

@@ -676,6 +676,7 @@ int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey)
 static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
 {
 	struct smp_cmd_pairing rsp, *req = (void *) skb->data;
+	struct hci_dev *hdev = conn->hcon->hdev;
 	struct smp_chan *smp;
 	u8 key_size, auth, sec_level;
 	int ret;
@@ -696,6 +697,10 @@ static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
 	if (!smp)
 		return SMP_UNSPECIFIED;
 
+	if (!test_bit(HCI_PAIRABLE, &hdev->dev_flags) &&
+	    (req->auth_req & SMP_AUTH_BONDING))
+		return SMP_PAIRING_NOTSUPP;
+
 	smp->preq[0] = SMP_CMD_PAIRING_REQ;
 	memcpy(&smp->preq[1], req, sizeof(*req));
 	skb_pull(skb, sizeof(*req));
@@ -911,6 +916,10 @@ static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
 	if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags))
 		return 0;
 
+	if (!test_bit(HCI_PAIRABLE, &hcon->hdev->dev_flags) &&
+	    (rp->auth_req & SMP_AUTH_BONDING))
+		return SMP_PAIRING_NOTSUPP;
+
 	smp = smp_chan_create(conn);
 	if (!smp)
 		return SMP_UNSPECIFIED;