Commit 600b2150 authored Mar 28, 2015 by Johan Hedberg Committed by Marcel Holtmann Mar 28, 2015

Bluetooth: Fix race condition with HCI_RESET flag



During the HCI init phase a completed request might be the last part of
the setup procedure after which the actual init procedure starts. The
init procedure begins with a call to hci_reset_req() which sets the
HCI_RESET flag. The purpose of this flag is to make us ignore any
updates to ncmd/cmd_cnt as long as we haven't received the command
complete event for the HCI_Reset. There's a potential race with this
however:

	hci_req_cmd_complete(hdev, opcode, status);

	if (ev->ncmd && !test_bit(HCI_RESET, &hdev->flags)) {
		atomic_set(&hdev->cmd_cnt, 1);
		if (!skb_queue_empty(&hdev->cmd_q))
			queue_work(hdev->workqueue, &hdev->cmd_work);
	}

Since the hci_req_cmd_complete() will trigger the completion of the
setup stage, it's possible that hci_reset_req() gets called before we
try to read ev->ncmd and the HCI_RESET flag. Because of this the cmd_cnt
would never be updated and the hci_reset_req() in practice ends up
blocking itself.

This patch fixes the issue by updating cmd_cnt before notifying the
request completion, and then reading it again to determine whether the
cmd_work should be queued or not.

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

parent 6331c686

net/bluetooth/hci_event.c

+10 −10

Original line number	Diff line number	Diff line
		@@ -3027,14 +3027,14 @@ static void hci_cmd_complete_evt(struct hci_dev hdev, struct sk_buff skb)
		if (opcode != HCI_OP_NOP)
		cancel_delayed_work(&hdev->cmd_timer);

		if (ev->ncmd && !test_bit(HCI_RESET, &hdev->flags))
		atomic_set(&hdev->cmd_cnt, 1);

		hci_req_cmd_complete(hdev, opcode, status);

		if (ev->ncmd && !test_bit(HCI_RESET, &hdev->flags)) {
		atomic_set(&hdev->cmd_cnt, 1);
		if (!skb_queue_empty(&hdev->cmd_q))
		if (atomic_read(&hdev->cmd_cnt) && !skb_queue_empty(&hdev->cmd_q))
		queue_work(hdev->workqueue, &hdev->cmd_work);
		}
		}

		static void hci_cmd_status_evt(struct hci_dev hdev, struct sk_buff skb)
		{
		@@ -3122,16 +3122,16 @@ static void hci_cmd_status_evt(struct hci_dev hdev, struct sk_buff skb)
		if (opcode != HCI_OP_NOP)
		cancel_delayed_work(&hdev->cmd_timer);

		if (ev->ncmd && !test_bit(HCI_RESET, &hdev->flags))
		atomic_set(&hdev->cmd_cnt, 1);

		if (ev->status \|\|
		(hdev->sent_cmd && !bt_cb(hdev->sent_cmd)->req_event))
		hci_req_cmd_complete(hdev, opcode, ev->status);

		if (ev->ncmd && !test_bit(HCI_RESET, &hdev->flags)) {
		atomic_set(&hdev->cmd_cnt, 1);
		if (!skb_queue_empty(&hdev->cmd_q))
		if (atomic_read(&hdev->cmd_cnt) && !skb_queue_empty(&hdev->cmd_q))
		queue_work(hdev->workqueue, &hdev->cmd_work);
		}
		}

		static void hci_hardware_error_evt(struct hci_dev hdev, struct sk_buff skb)
		{