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Bluetooth: Fix locking of hdev when calling into SMP code 

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>
Cc: stable@vger.kernel.org
This commit is contained in:
Johan Hedberg 2014-06-13 10:22:28 +03:00 committed by Marcel Holtmann
parent 7ab56c3a6e
commit c73f94b8c0
1 changed files with 6 additions and 1 deletions
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7
net/bluetooth/mgmt.c
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@ -3031,8 +3031,13 @@ 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,