Commit f98aa80f authored by Venkata Lakshmi Narayana Gubba's avatar Venkata Lakshmi Narayana Gubba Committed by Marcel Holtmann
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Bluetooth: hci_qca: Bug fix during SSR timeout 



Due to race conditions between qca_hw_error and qca_controller_memdump
during SSR timeout,the same pointer is freed twice. This results in a
double free. Now a lock is acquired before checking the stauts of SSR
state.

Fixes: d841502c ("Bluetooth: hci_qca: Collect controller memory dump during SSR")
Signed-off-by: default avatarVenkata Lakshmi Narayana Gubba <gubbaven@codeaurora.org>
Reviewed-by: default avatarAbhishek Pandit-Subedi <abhishekpandit@chromium.org>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent a9ec8423

drivers/bluetooth/hci_qca.c

+17 −12
Original line number Diff line number Diff line
@@ -981,8 +981,11 @@ static void qca_controller_memdump(struct work_struct *work) 
	while ((skb = skb_dequeue(&qca->rx_memdump_q))) {



		mutex_lock(&qca->hci_memdump_lock);

		/* Skip processing the received packets if timeout detected. */

		if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT) {

		/* Skip processing the received packets if timeout detected

		 * or memdump collection completed.

		 */

		if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT ||

		    qca->memdump_state == QCA_MEMDUMP_COLLECTED) {

			mutex_unlock(&qca->hci_memdump_lock);

			return;

		}
@@ -1483,8 +1486,6 @@ static void qca_hw_error(struct hci_dev *hdev, u8 code) 
{

	struct hci_uart *hu = hci_get_drvdata(hdev);

	struct qca_data *qca = hu->priv;

	struct qca_memdump_data *qca_memdump = qca->qca_memdump;

	char *memdump_buf = NULL;



	set_bit(QCA_HW_ERROR_EVENT, &qca->flags);

	bt_dev_info(hdev, "mem_dump_status: %d", qca->memdump_state);
@@ -1507,19 +1508,23 @@ static void qca_hw_error(struct hci_dev *hdev, u8 code) 
		qca_wait_for_dump_collection(hdev);

	}



	mutex_lock(&qca->hci_memdump_lock);

	if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) {

		bt_dev_err(hu->hdev, "clearing allocated memory due to memdump timeout");

		mutex_lock(&qca->hci_memdump_lock);

		if (qca_memdump)

			memdump_buf = qca_memdump->memdump_buf_head;

		vfree(memdump_buf);

		kfree(qca_memdump);

		if (qca->qca_memdump) {

			vfree(qca->qca_memdump->memdump_buf_head);

			kfree(qca->qca_memdump);

			qca->qca_memdump = NULL;

		}

		qca->memdump_state = QCA_MEMDUMP_TIMEOUT;

		cancel_delayed_work(&qca->ctrl_memdump_timeout);

		skb_queue_purge(&qca->rx_memdump_q);

	}

	mutex_unlock(&qca->hci_memdump_lock);



	if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT ||

	    qca->memdump_state == QCA_MEMDUMP_COLLECTED) {

		cancel_work_sync(&qca->ctrl_memdump_evt);

		skb_queue_purge(&qca->rx_memdump_q);

	}



	clear_bit(QCA_HW_ERROR_EVENT, &qca->flags);

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