netdev - Re: [PATCH RFC v2 net-next 19/21] net/ipv6: separate handling of FIB entries from dst based routes

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Date:   Sat, 24 Mar 2018 09:31:02 -0600
From:   David Ahern <dsahern@...il.com>
To:     Ido Schimmel <idosch@...sch.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        roopa@...ulusnetworks.com, eric.dumazet@...il.com,
        weiwan@...gle.com, kafai@...com, yoshfuji@...ux-ipv6.org
Subject: Re: [PATCH RFC v2 net-next 19/21] net/ipv6: separate handling of FIB
 entries from dst based routes

On 3/24/18 8:31 AM, Ido Schimmel wrote:
> On Sun, Mar 18, 2018 at 08:36:20PM -0700, David Ahern wrote:
>> @@ -405,18 +383,9 @@ static void ip6_dst_destroy(struct dst_entry *dst)
>>  		rt->rt6i_idev = NULL;
>>  		in6_dev_put(idev);
>>  	}
>> -	bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, 1);
>> -	if (bucket) {
>> -		rt->rt6i_exception_bucket = NULL;
>> -		kfree(bucket);
>> -	}
>> -
>> -	m = rt->fib6_metrics;
>> -	if (m != &dst_default_metrics && refcount_dec_and_test(&m->refcnt))
>> -		kfree(m);
> 
> You remove this...
> 
>>  
>>  	rt->from = NULL;
>> -	dst_release(&from->dst);
>> +	fib6_info_release(from);
> 
> Yet fib6_info_release() doesn't take care of it (unlike the IPv4
> equivalent), which means you're leaking the metrics.
> 
>>  }

ok, I'll take a look. I thought I verified both paths (fib6_info and
dst) were freeing the metrics.