netdev - Re: [patch net] ipv4: fix nexthop attlen check in fib_nh

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Date:	Mon, 13 Oct 2014 05:22:46 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jiri Pirko <jiri@...nulli.us>, Thomas Graf <tgraf@...g.ch>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net
Subject: Re: [patch net] ipv4: fix nexthop attlen check in fib_nh_match

On Mon, 2014-10-13 at 11:54 +0200, Jiri Pirko wrote:
> fib_nh_match does not match nexthops correctly. Example:
> 
> This command is not successful and route is removed. After this patch
> applied, the route is correctly matched and result is:
> RTNETLINK answers: No such process
> 
> Please consider this for stable trees as well.
> 
> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
> ---
>  net/ipv4/fib_semantics.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
> index 5b6efb3..f99f41b 100644
> --- a/net/ipv4/fib_semantics.c
> +++ b/net/ipv4/fib_semantics.c
> @@ -537,7 +537,7 @@ int fib_nh_match(struct fib_config *cfg, struct fib_info *fi)
>  			return 1;
>  
>  		attrlen = rtnh_attrlen(rtnh);
> -		if (attrlen < 0) {
> +		if (attrlen > 0) {
>  			struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
>  
>  			nla = nla_find(attrs, attrlen, RTA_GATEWAY);

Fixes: 4e902c57417c4 ("[IPv4]: FIB configuration using struct fib_config")

Good catch, thanks !

Acked-by: Eric Dumazet <edumazet@...gle.com>


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