linux-kernel - Re: [PATCH] ipv6: esp6: use BUG_ON instead of if condition followed by BUG

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Date:   Wed, 25 Oct 2017 12:07:51 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Cc:     Steffen Klassert <steffen.klassert@...unet.com>,
        "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipv6: esp6: use BUG_ON instead of if condition followed
 by BUG

On Tue, Oct 24, 2017 at 11:28:26AM -0500, Gustavo A. R. Silva wrote:
> Use BUG_ON instead of if condition followed by BUG in esp_remove_trailer.
> 
> This issue was detected with the help of Coccinelle.
> 
> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
> ---
>  net/ipv6/esp6.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
> index 89910e2..603ff06 100644
> --- a/net/ipv6/esp6.c
> +++ b/net/ipv6/esp6.c
> @@ -483,8 +483,7 @@ static inline int esp_remove_trailer(struct sk_buff *skb)
>  		goto out;
>  	}
>  
> -	if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
> -		BUG();
> +	BUG_ON(skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2));

How about

	ret = skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2);
	BUG_ON(ret);

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt