linux-kernel - Re: [PATCH] virtio_net: fix mergeable bufs error handling

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Date:   Thu, 30 Mar 2017 11:59:21 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>, linux-kernel@...r.kernel.org
Cc:     John Fastabend <john.fastabend@...il.com>,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH] virtio_net: fix mergeable bufs error handling



On 2017年03月29日 20:37, Michael S. Tsirkin wrote:
> On xdp error we try to free head_skb without having
> initialized it, that's clearly bogus.
>
> Fixes: f600b6905015 ("virtio_net: Add XDP support")
> Cc: John Fastabend <john.fastabend@...il.com>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>   drivers/net/virtio_net.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 11773d6..e0fb3707 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -570,7 +570,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
>   	u16 num_buf;
>   	struct page *page;
>   	int offset;
> -	struct sk_buff *head_skb, *curr_skb;
> +	struct sk_buff *head_skb = NULL, *curr_skb;
>   	struct bpf_prog *xdp_prog;
>   	unsigned int truesize;
>   

My tree (net.git HEAD is 8f1f7eeb22c16a197159cf7b35d1350695193ead) has:

     head_skb = NULL;

just after the above codes.

Thanks