Commit c73f94b8 authored Jun 13, 2014 by Johan Hedberg Committed by Marcel Holtmann Jun 13, 2014

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

parent 7ab56c3a

net/bluetooth/mgmt.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -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,

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