netdev - Re: [PATCH net-next] net: ipv4: Remove unneed BUG() function

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Date:   Mon, 7 Jun 2021 10:20:54 -0600
From:   David Ahern <dsahern@...il.com>
To:     Zheng Yongjun <zhengyongjun3@...wei.com>, davem@...emloft.net,
        yoshfuji@...ux-ipv6.org, dsahern@...nel.org, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: ipv4: Remove unneed BUG() function

On 6/7/21 8:39 AM, Zheng Yongjun wrote:
> When 'nla_parse_nested_deprecated' failed, it's no need to
> BUG() here, return -EINVAL is ok.
> 
> Signed-off-by: Zheng Yongjun <zhengyongjun3@...wei.com>
> ---
>  net/ipv4/devinet.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
> index 2e35f68da40a..1c6429c353a9 100644
> --- a/net/ipv4/devinet.c
> +++ b/net/ipv4/devinet.c
> @@ -1989,7 +1989,7 @@ static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla,
>  		return -EAFNOSUPPORT;
>  
>  	if (nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0)

Avoid assumptions on the failure reason:

	int err;

	err = nla_parse_nested_deprecated();
	if (err < 0)
		return err;

> -		BUG();
> +		return -EINVAL;
>  
>  	if (tb[IFLA_INET_CONF]) {
>  		nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
> 

seems like this patch and a similar fix for the IPv6 version of
set_link_af should go to net rather than net-next.