On Fri, 17 Sep 2021 16:34:06 +0800, Jason Wang <jasowang@xxxxxxxxxx> wrote:
> We try to use build_skb() if we had sufficient tailroom. But we forget
> to release the unused pages chained via private in big mode which will
> leak pages. Fixing this by release the pages after building the skb in
> big mode.
>
> Cc: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
> Fixes: fb32856b16ad ("virtio-net: page_to_skb() use build_skb when there's sufficient tailroom")
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
LGTM
Reviewed-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
Thanks.
> ---
> drivers/net/virtio_net.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 271d38c1d9f8..79bd2585ec6b 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -423,6 +423,10 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
>
> skb_reserve(skb, p - buf);
> skb_put(skb, len);
> +
> + page = (struct page *)page->private;
> + if (page)
> + give_pages(rq, page);
> goto ok;
> }
>
> --
> 2.25.1
>
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