Bluetooth: Don't bother user space without IO capabilities

If user space has a NoInputNoOutput IO capability it makes no sense to
bother it with confirmation requests. This patch updates both SSP and
SMP to check for the local IO capability before sending a user
confirmation request to user space.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

2 files changed, 7 insertions, 1 deletions

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 1ac526022ad9..1bd4de7e74fc 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -3752,9 +3752,11 @@ static void hci_user_confirm_request_evt(struct hci_dev *hdev,
                 /* If we're not the initiators request authorization to
                  * proceed from user space (mgmt_user_confirm with
                  * confirm_hint set to 1). The exception is if neither
-                 * side had MITM in which case we do auto-accept.
+                 * side had MITM or if the local IO capability is
+                 * NoInputNoOutput, in which case we do auto-accept
                  */
                 if (!test_bit(HCI_CONN_AUTH_PEND, &conn->flags) &&
+                    conn->io_capability != HCI_IO_NO_INPUT_OUTPUT &&
                     (loc_mitm || rem_mitm)) {
                         BT_DBG("Confirming auto-accept as acceptor");
                         confirm_hint = 1;
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index 70b726518d7b..74a0308e39f3 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -431,6 +431,10 @@ static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
         if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags))
                 method = JUST_WORKS;
 
+        /* Don't bother user space with no IO capabilities */
+        if (method == JUST_CFM && hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
+                method = JUST_WORKS;
+
         /* If Just Works, Continue with Zero TK */
         if (method == JUST_WORKS) {
                 set_bit(SMP_FLAG_TK_VALID, &smp->flags);