linux-kernel - Re: [PATCH Resend] Bluetooth: virtio_bt: Use skb

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Date:   Tue, 26 Jul 2022 11:56:39 -0700
From:   Luiz Augusto von Dentz <luiz.dentz@...il.com>
To:     Soenke Huster <soenke.huster@...oes.de>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH Resend] Bluetooth: virtio_bt: Use skb_put to set length

Hi Soenke,

On Sun, Jul 24, 2022 at 11:53 PM Soenke Huster <soenke.huster@...oes.de> wrote:
>
> By using skb_put we ensure that skb->tail is set
> correctly. Currently, skb->tail is always zero, which
> leads to errors, such as the following page fault in
> rfcomm_recv_frame:
>
>     BUG: unable to handle page fault for address: ffffed1021de29ff
>     #PF: supervisor read access in kernel mode
>     #PF: error_code(0x0000) - not-present page
>     RIP: 0010:rfcomm_run+0x831/0x4040 (net/bluetooth/rfcomm/core.c:1751)

Please add the Fixes tag with the original patch that introduced the problem.

> Signed-off-by: Soenke Huster <soenke.huster@...oes.de>
> ---
>  drivers/bluetooth/virtio_bt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/bluetooth/virtio_bt.c b/drivers/bluetooth/virtio_bt.c
> index 67c21263f9e0..fd281d439505 100644
> --- a/drivers/bluetooth/virtio_bt.c
> +++ b/drivers/bluetooth/virtio_bt.c
> @@ -219,7 +219,7 @@ static void virtbt_rx_work(struct work_struct *work)
>         if (!skb)
>                 return;
>
> -       skb->len = len;
> +       skb_put(skb, len);
>         virtbt_rx_handle(vbt, skb);
>
>         if (virtbt_add_inbuf(vbt) < 0)
> --
> 2.36.1
>


-- 
Luiz Augusto von Dentz