linux-kernel - 答复: [PATCH net-next] net: ipv4: use BUG_ON instead of if condition followed by BUG

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Date:   Mon, 7 Jun 2021 14:25:02 +0000
From:   zhengyongjun <zhengyongjun3@...wei.com>
To:     David Ahern <dsahern@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "yoshfuji@...ux-ipv6.org" <yoshfuji@...ux-ipv6.org>,
        "dsahern@...nel.org" <dsahern@...nel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: 答复: [PATCH net-next] net: ipv4: use BUG_ON instead of if condition followed by BUG

Thanks for your advice, I will do as your advice and send patch ' 0001-net-ipv4-Remove-unneed-BUG-function.patch ' :)

-----邮件原件-----
发件人: David Ahern [mailto:dsahern@...il.com] 
发送时间: 2021年6月7日 21:00
收件人: zhengyongjun <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
主题: Re: [PATCH net-next] net: ipv4: use BUG_ON instead of if condition followed by BUG

On 6/7/21 3:11 AM, Zheng Yongjun wrote:
> Use BUG_ON instead of if condition followed by BUG in inet_set_link_af.
> 
> This issue was detected with the help of Coccinelle.
> 
> Signed-off-by: Zheng Yongjun <zhengyongjun3@...wei.com>
> ---
>  net/ipv4/devinet.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c index 
> 2e35f68da40a..e3e1e8a600ef 100644
> --- a/net/ipv4/devinet.c
> +++ b/net/ipv4/devinet.c
> @@ -1988,8 +1988,7 @@ static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla,
>  	if (!in_dev)
>  		return -EAFNOSUPPORT;
>  
> -	if (nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0)
> -		BUG();
> +	BUG_ON(nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, NULL, 
> +NULL) < 0);
>  
>  	if (tb[IFLA_INET_CONF]) {
>  		nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
> 

no reason to have a BUG here at all. Catch the error and return.