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

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Date:   Fri, 5 Oct 2018 06:08:57 -0700
From:   Eric Dumazet <eric.dumazet@...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, dsahern@...il.com
Subject: Re: [PATCH net-next 0/5] net: Consolidate metrics handling for ipv4
 and ipv6



On 10/05/2018 05:17 AM, Eric Dumazet wrote:
> 
> 
> On 10/04/2018 09:55 PM, David Miller wrote:
>> From: David Ahern <dsahern@...nel.org>
>> Date: Thu,  4 Oct 2018 20:07:50 -0700
>>
>>> From: David Ahern <dsahern@...il.com>
>>>
>>> As part of the IPv6 fib info refactoring, the intent was to make metrics
>>> handling for ipv6 identical to ipv4. One oversight in ip6_dst_destroy
>>> led to confusion and a couple of incomplete attempts at finding and
>>> fixing the resulting memory leak which was ultimately resolved by
>>> ce7ea4af0838 ("ipv6: fix memory leak on dst->_metrics").
>>>
>>> Refactor metrics hanlding make the code really identical for v4 and v6,
>>> and add a few test cases.
>>
>> Looks nice, series applied, thanks David.
>>
> 
> Does not look well tested and reviewed to me.

For some reason I have not received the patch series in my inbox, I only got
your "series applied" message.

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;
        }