Bluetooth: Don't try to confirm locally initiated SMP pairing

In the case that the just-works model would be triggered we only want to
confirm remotely initiated pairings (i.e. those triggered by a Security
Request or Pairing Request). This patch adds the necessary check to the
tk_request function to fall back to the JUST_WORKS method in the case of
a locally initiated pairing.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

net/bluetooth/smp.c

@@ -387,6 +387,11 @@ static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
 	if (!(auth & SMP_AUTH_BONDING) && method == JUST_CFM)
 		method = JUST_WORKS;
 
+	/* Don't confirm locally initiated pairing attempts */
+	if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR,
+					   &smp->smp_flags))
+		method = JUST_WORKS;
+
 	/* If Just Works, Continue with Zero TK */
 	if (method == JUST_WORKS) {
 		set_bit(SMP_FLAG_TK_VALID, &smp->smp_flags);