linux-kernel - Re: [6.3][regression] commit 2f5c3c77fc9b6a34b68b97231bfa970e1194ec28 definitely causes use-after-free

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Date:   Fri, 24 Feb 2023 02:28:36 +0500
From:   Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     Felix Fietkau <nbd@....name>, deren.wu@...iatek.com,
        Linux List Kernel Mailing <linux-wireless@...r.kernel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>
Subject: Re: [6.3][regression] commit 2f5c3c77fc9b6a34b68b97231bfa970e1194ec28
 definitely causes use-after-free

On Thu, Feb 23, 2023 at 10:38 PM Lorenzo Bianconi <lorenzo@...nel.org> wrote:
>
> Hi Mike,
>
> can you please check if the patch below fixes the issue?
>
> Regards,
> Lorenzo
>
> diff --git a/drivers/net/wireless/mediatek/mt76/usb.c b/drivers/net/wireless/mediatek/mt76/usb.c
> index b88959ef38aa..5e5c7bf51174 100644
> --- a/drivers/net/wireless/mediatek/mt76/usb.c
> +++ b/drivers/net/wireless/mediatek/mt76/usb.c
> @@ -706,6 +706,7 @@ mt76u_free_rx_queue(struct mt76_dev *dev, struct mt76_queue *q)
>                 q->entry[i].urb = NULL;
>         }
>         page_pool_destroy(q->page_pool);
> +       q->page_pool = NULL;
>  }
>
>  static void mt76u_free_rx(struct mt76_dev *dev)
>
>

Thanks, with this patch use-after-free issue gone.

Tested-by: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>

-- 
Best Regards,
Mike Gavrilov.