On Thu, Aug 4, 2022 at 2:33 PM Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx> wrote:
>
> When we call xdp_convert_buff_to_frame() to get xdpf, if it returns
> NULL, we should check if xdp_page was allocated by xdp_linearize_page().
> If it is newly allocated, it should be freed here alone. Just like any
> other "goto err_xdp".
>
> Fixes: 44fa2dbd4759 ("xdp: transition into using xdp_frame for ndo_xdp_xmit")
> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
> ---
> drivers/net/virtio_net.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index ec8e1b3108c3..3b3eebad3977 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1057,8 +1057,11 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
> case XDP_TX:
> stats->xdp_tx++;
> xdpf = xdp_convert_buff_to_frame(&xdp);
> - if (unlikely(!xdpf))
> + if (unlikely(!xdpf)) {
> + if (unlikely(xdp_page != page))
> + put_page(xdp_page);
> goto err_xdp;
> + }
> err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
> if (unlikely(!err)) {
> xdp_return_frame_rx_napi(xdpf);
> --
> 2.31.0
>
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