netdev - Re: [Patch net v3] ipv6: check for ip6_null_entry in __ip6_del_rt

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Date:   Thu, 02 Mar 2017 12:45:03 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     dsa@...ulusnetworks.com
Cc:     xiyou.wangcong@...il.com, netdev@...r.kernel.org,
        andreyknvl@...gle.com, eric.dumazet@...il.com
Subject: Re: [Patch net v3] ipv6: check for ip6_null_entry in
 __ip6_del_rt_siblings()

From: David Ahern <dsa@...ulusnetworks.com>
Date: Wed, 1 Mar 2017 15:03:45 -0800

> On 2/27/17 4:07 PM, Cong Wang wrote:
>> Andrey reported a NULL pointer deref bug in ipv6_route_ioctl()
>> -> ip6_route_del() -> __ip6_del_rt_siblings() code path. This is
>> because ip6_null_entry is returned in this path since ip6_null_entry
>> is kinda default for a ipv6 route table root node. Quote from
>> David Ahern:
>> 
>>  ip6_null_entry is the root of all ipv6 fib tables making it integrated
>>  into the table ...
>> 
>> We should ignore any attempt of trying to delete it, like we do in
>> __ip6_del_rt() path and several others.
>> 
>> Reported-by: Andrey Konovalov <andreyknvl@...gle.com>
>> Fixes: 0ae8133586ad ("net: ipv6: Allow shorthand delete of all nexthops in multipath route")
>> Cc: David Ahern <dsa@...ulusnetworks.com>
>> Cc: Eric Dumazet <eric.dumazet@...il.com>
>> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
>> ---
>>  net/ipv6/route.c | 14 +++++++++-----
>>  1 file changed, 9 insertions(+), 5 deletions(-)
> 
> 
> Acked-by: David Ahern <dsa@...ulusnetworks.com>

Applied, thanks.