netdev - Re: [Patch net] ipv6: check for ip6_null_entry in __ip6_del_rt

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Date:   Mon, 27 Feb 2017 13:06:49 -0800
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [Patch net] ipv6: check for ip6_null_entry in
 __ip6_del_rt_siblings()

On 2/27/17 1:04 PM, Cong Wang wrote:
>>
>>                 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
>> +                       /* do not allow deletion of the null route */
>> +                       if (rt == net->ipv6.ip6_null_entry)
>> +                               continue;
>>
>> Fixes: 0ae8133586ad net: ipv6: Allow shorthand delete of all nexthops in
>> multipath route
> 
> Note, I moved the check into __ip6_del_rt_siblings() because __ip6_del_rt()
> has a same check.
> 

that's b/c __ip6_del_rt has a second call path. __ip6_del_rt_siblings is
new and is not expecting to see the null entry. Catching it before the
dst_hold would be better.