Bluetooth: Fix locking of hdev when calling into SMP code

commit c73f94b8c093a615ce80eabbde0ac6eb9abfe31a upstream.

The SMP code expects hdev to be unlocked since e.g. crypto functions
will try to (re)lock it. Therefore, we need to release the lock before
calling into smp.c from mgmt.c. Without this we risk a deadlock whenever
the smp_user_confirm_reply() function is called.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Tested-by: Lukasz Rymanowski <lukasz.rymanowski@tieto.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index a03ca3c..f1ac2a7 100644 (file)
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -2826,8 +2826,13 @@ static int user_pairing_resp(struct sock *sk, struct hci_dev *hdev,
        }
 
        if (addr->type == BDADDR_LE_PUBLIC || addr->type == BDADDR_LE_RANDOM) {
-               /* Continue with pairing via SMP */
+               /* Continue with pairing via SMP. The hdev lock must be
+                * released as SMP may try to recquire it for crypto
+                * purposes.
+                */
+               hci_dev_unlock(hdev);
                err = smp_user_confirm_reply(conn, mgmt_op, passkey);
+               hci_dev_lock(hdev);
 
                if (!err)
                        err = cmd_complete(sk, hdev->id, mgmt_op,