netdev - Re: [PATCH net-next 0/5] net: Consolidate metrics handling for ipv4 and ipv6

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Date:   Fri, 5 Oct 2018 09:37:23 -0600
From:   David Ahern <dsahern@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        David Miller <davem@...emloft.net>, dsahern@...nel.org
Cc:     netdev@...r.kernel.org, weiwan@...gle.com, sd@...asysnail.net,
        xiyou.wangcong@...il.com
Subject: Re: [PATCH net-next 0/5] net: Consolidate metrics handling for ipv4
 and ipv6

On 10/5/18 7:08 AM, Eric Dumazet wrote:
> Commit 767a2217533fed6 ("net: common metrics init helper for FIB entries")
> is not correct because we need to better deal with error paths.
> 
> I will submit this more formally when I can reach my workstation in a few minutes :
> 
> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index 6c1d817151cae45421dc976c5ea082b4115650be..74d97addf1af20dda0c2b6a2018e88696f9f7d5a 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -2976,6 +2976,8 @@ static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
>         rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len);
>         if (IS_ERR(rt->fib6_metrics)) {
>                 err = PTR_ERR(rt->fib6_metrics);
> +               /* Do not leave garbage there. */
> +               rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
>                 goto out;
>         }
>  
> 

Yes, I was focused on the memory leaks and cleanup and forgot to
purposely fail the alloc for the metrics. The above is one way to fix
it. Thanks for spotting it.