linux-kernel - Re: [PATCH] virtio_net: Remove BUG() to aviod machine dead

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Date:   Tue, 18 May 2021 05:54:54 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Xianting Tian <xianting.tian@...ux.alibaba.com>
Cc:     jasowang@...hat.com, davem@...emloft.net, kuba@...nel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio_net: Remove BUG() to aviod machine dead

typo in subject

On Tue, May 18, 2021 at 05:46:56PM +0800, Xianting Tian wrote:
> When met error, we output a print to avoid a BUG().
> 
> Signed-off-by: Xianting Tian <xianting.tian@...ux.alibaba.com>
> ---
>  drivers/net/virtio_net.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index c921ebf3ae82..a66174d13e81 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1647,9 +1647,8 @@ static int xmit_skb(struct send_queue *sq, struct
> sk_buff *skb)
>  		hdr = skb_vnet_hdr(skb);
> 
>  	if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
> -				    virtio_is_little_endian(vi->vdev), false,
> -				    0))
> -		BUG();
> +				virtio_is_little_endian(vi->vdev), false, 0))
> +		return -EPROTO;
> 

why EPROTO? can you add some comments to explain what is going on pls?

is this related to a malicious hypervisor thing?

don't we want at least a WARN_ON? Or _ONCE?

>  	if (vi->mergeable_rx_bufs)
>  		hdr->num_buffers = 0;
> -- 
> 2.17.1