netdev - Re: [PATCH net v1 2/2] virtio_net: free xdp shinfo frags when build_skb_from_xdp

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Date:   Tue, 14 Mar 2023 19:19:19 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, <netdev@...r.kernel.org>
CC:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Heng Qi <hengqi@...ux.alibaba.com>,
        <virtualization@...ts.linux-foundation.org>, <bpf@...r.kernel.org>
Subject: Re: [PATCH net v1 2/2] virtio_net: free xdp shinfo frags when
 build_skb_from_xdp_buff() fails

On 2023/3/14 18:49, Xuan Zhuo wrote:
> build_skb_from_xdp_buff() may return NULL, in this case
> we need to free the frags of xdp shinfo.
> 
> Fixes: fab89bafa95b ("virtio-net: support multi-buffer xdp")
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> Acked-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  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 8ecf7a341d54..d36183be0481 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1273,9 +1273,12 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
>  
>  		switch (act) {
>  		case XDP_PASS:
> +			head_skb = build_skb_from_xdp_buff(dev, vi, &xdp, xdp_frags_truesz);
> +			if (!head_skb)

It is a error case, perhaps add a unlikely() for it.

> +				goto err_xdp_frags;
> +
>  			if (unlikely(xdp_page != page))
>  				put_page(page);
> -			head_skb = build_skb_from_xdp_buff(dev, vi, &xdp, xdp_frags_truesz);
>  			rcu_read_unlock();
>  			return head_skb;
>  		case XDP_TX:
>