[Intel-wired-lan] [PATCH net] i40e: proper update of the page_offset field

Alexander Duyck alexander.duyck at gmail.com
Mon May 15 00:31:55 UTC 2017


On Sun, May 14, 2017 at 10:56 AM, Björn Töpel <bjorn.topel at gmail.com> wrote:
> From: Björn Töpel <bjorn.topel at intel.com>
>
> In f8b45b74cc62 ("i40e/i40evf: Use build_skb to build frames")
> i40e_build_skb updates the page_offset field with an incorrect offset,
> which can lead to data corruption. This patch updates page_offset
> correctly.
>
> Note that the bug only appears on architectures where PAGE_SIZE is
> 8192 or larger.
>
> Fixes: f8b45b74cc62 ("i40e/i40evf: Use build_skb to build frames")
> Signed-off-by: Björn Töpel <bjorn.topel at intel.com>

Minor nit. I think i40evf has the same issue and requires the same
fix. Can you add that to this patch and resubmit? Otherwise this fix
looks good to me.

> ---
>  drivers/net/ethernet/intel/i40e/i40e_txrx.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> index 29321a6167a6..cd894f4023b1 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> @@ -1854,7 +1854,8 @@ static struct sk_buff *i40e_build_skb(struct i40e_ring *rx_ring,
>  #if (PAGE_SIZE < 8192)
>         unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2;
>  #else
> -       unsigned int truesize = SKB_DATA_ALIGN(size);
> +       unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) +
> +                               SKB_DATA_ALIGN(I40E_SKB_PAD + size);
>  #endif
>         struct sk_buff *skb;
>
> --
> 2.11.0
>
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