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* [PATCH v2] Bluetooth: hci_qca: Bug fix during SSR timeout
@ 2020-06-09 15:57 Venkata Lakshmi Narayana Gubba
  2020-06-09 16:00 ` Abhishek Pandit-Subedi
  2020-06-10  7:50 ` Marcel Holtmann
  0 siblings, 2 replies; 3+ messages in thread
From: Venkata Lakshmi Narayana Gubba @ 2020-06-09 15:57 UTC (permalink / raw)
  To: marcel, johan.hedberg
  Cc: mka, linux-kernel, linux-bluetooth, hemantg, linux-arm-msm,
	bgodavar, rjliao, hbandi, abhishekpandit,
	Venkata Lakshmi Narayana Gubba

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: d841502c79e3 ("Bluetooth: hci_qca: Collect controller memory dump during SSR")
Signed-off-by: Venkata Lakshmi Narayana Gubba <gubbaven@codeaurora.org>
---
 drivers/bluetooth/hci_qca.c | 29 +++++++++++++++++------------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 28c34a1..f3fde99 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -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);
-		qca->qca_memdump = NULL;
+		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);
+	}
+	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);
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member 
of Code Aurora Forum, hosted by The Linux Foundation


^ permalink raw reply related	[flat|nested] 3+ messages in thread

* Re: [PATCH v2] Bluetooth: hci_qca: Bug fix during SSR timeout
  2020-06-09 15:57 [PATCH v2] Bluetooth: hci_qca: Bug fix during SSR timeout Venkata Lakshmi Narayana Gubba
@ 2020-06-09 16:00 ` Abhishek Pandit-Subedi
  2020-06-10  7:50 ` Marcel Holtmann
  1 sibling, 0 replies; 3+ messages in thread
From: Abhishek Pandit-Subedi @ 2020-06-09 16:00 UTC (permalink / raw)
  To: Venkata Lakshmi Narayana Gubba
  Cc: Marcel Holtmann, Johan Hedberg, Matthias Kaehlcke, LKML,
	Bluez mailing list, hemantg, linux-arm-msm,
	Balakrishna Godavarthi, Rocky Liao, hbandi

Looks good to me.

Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>

On Tue, Jun 9, 2020 at 8:57 AM Venkata Lakshmi Narayana Gubba
<gubbaven@codeaurora.org> wrote:
>
> 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: d841502c79e3 ("Bluetooth: hci_qca: Collect controller memory dump during SSR")
> Signed-off-by: Venkata Lakshmi Narayana Gubba <gubbaven@codeaurora.org>
> ---
>  drivers/bluetooth/hci_qca.c | 29 +++++++++++++++++------------
>  1 file changed, 17 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index 28c34a1..f3fde99 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -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);
> -               qca->qca_memdump = NULL;
> +               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);
> +       }
> +       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);
> --
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH v2] Bluetooth: hci_qca: Bug fix during SSR timeout
  2020-06-09 15:57 [PATCH v2] Bluetooth: hci_qca: Bug fix during SSR timeout Venkata Lakshmi Narayana Gubba
  2020-06-09 16:00 ` Abhishek Pandit-Subedi
@ 2020-06-10  7:50 ` Marcel Holtmann
  1 sibling, 0 replies; 3+ messages in thread
From: Marcel Holtmann @ 2020-06-10  7:50 UTC (permalink / raw)
  To: Venkata Lakshmi Narayana Gubba
  Cc: Johan Hedberg, Matthias Kaehlcke, open list, Bluez mailing list,
	Hemantg, MSM, Balakrishna Godavarthi, Rocky Liao, hbandi,
	abhishekpandit

Hi Venkata,

> 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: d841502c79e3 ("Bluetooth: hci_qca: Collect controller memory dump during SSR")
> Signed-off-by: Venkata Lakshmi Narayana Gubba <gubbaven@codeaurora.org>
> ---
> drivers/bluetooth/hci_qca.c | 29 +++++++++++++++++------------
> 1 file changed, 17 insertions(+), 12 deletions(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel


^ permalink raw reply	[flat|nested] 3+ messages in thread

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2020-06-09 15:57 [PATCH v2] Bluetooth: hci_qca: Bug fix during SSR timeout Venkata Lakshmi Narayana Gubba
2020-06-09 16:00 ` Abhishek Pandit-Subedi
2020-06-10  7:50 ` Marcel Holtmann

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