netdev - Re: [PATCH] virtio_net: replace if (cond) BUG() with BUG

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Date:   Thu, 18 Mar 2021 10:18:13 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Cc:     mst@...hat.com, jasowang@...hat.com, davem@...emloft.net,
        kuba@...nel.org, ast@...nel.org, daniel@...earbox.net,
        hawk@...nel.org, john.fastabend@...il.com, andrii@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com,
        kpsingh@...nel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH] virtio_net: replace if (cond) BUG() with BUG_ON()

On Wed, Mar 17, 2021 at 01:57:15PM +0800, Jiapeng Chong wrote:
> Fix the following coccicheck warnings:
>
> ./drivers/net/virtio_net.c:1551:2-5: WARNING: Use BUG_ON instead of if
> condition followed by BUG.
>
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
> ---
>  drivers/net/virtio_net.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 82e520d..093530b 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1545,10 +1545,8 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
>  	else
>  		hdr = skb_vnet_hdr(skb);
>
> -	if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
> -				    virtio_is_little_endian(vi->vdev), false,
> -				    0))
> -		BUG();
> +	BUG_ON(virtio_net_hdr_from_skb(skb, &hdr->hdr,  virtio_is_little_endian(vi->vdev),
> +				       false, 0));

This BUG() in virtio isn't supposed to be in the first place.
You should return -EINVAL instead of crashing system.

Thanks

>
>  	if (vi->mergeable_rx_bufs)
>  		hdr->num_buffers = 0;
> --
> 1.8.3.1
>