netdev - Re: [PATCH net-next 3/3] net: systemport: Add a check for oversized packets

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Date:	Thu, 28 May 2015 21:00:48 -0700
From:	Petri Gynther <pgynther@...gle.com>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	netdev <netdev@...r.kernel.org>, David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next 3/3] net: systemport: Add a check for oversized packets

On Thu, May 28, 2015 at 3:24 PM, Florian Fainelli <f.fainelli@...il.com> wrote:
> Occasionnaly we may get oversized packets from the hardware which exceed
> the nomimal 2KiB buffer size we allocate SKBs with. Add an early check
> which drops the packet to avoid invoking skb_over_panic() and move on to
> processing the next packet.
>
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

Reviewed-by: Petri Gynther <pgynther@...gle.com>

> ---
>  drivers/net/ethernet/broadcom/bcmsysport.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
> index d777b0db9e63..909ad7a0d480 100644
> --- a/drivers/net/ethernet/broadcom/bcmsysport.c
> +++ b/drivers/net/ethernet/broadcom/bcmsysport.c
> @@ -638,6 +638,14 @@ static unsigned int bcm_sysport_desc_rx(struct bcm_sysport_priv *priv,
>                           p_index, priv->rx_c_index, priv->rx_read_ptr,
>                           len, status);
>
> +               if (unlikely(len > RX_BUF_LENGTH)) {
> +                       netif_err(priv, rx_status, ndev, "oversized packet\n");
> +                       ndev->stats.rx_length_errors++;
> +                       ndev->stats.rx_errors++;
> +                       dev_kfree_skb_any(skb);
> +                       goto next;
> +               }
> +
>                 if (unlikely(!(status & DESC_EOP) || !(status & DESC_SOP))) {
>                         netif_err(priv, rx_status, ndev, "fragmented packet!\n");
>                         ndev->stats.rx_dropped++;
> --
> 2.1.0
>
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