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

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Message-ID: <6d332a15-d86c-0b02-61e5-38d208f2caf7@cumulusnetworks.com>
Date:   Mon, 27 Feb 2017 16:14:04 -0800
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Cong Wang <xiyou.wangcong@...il.com>, netdev@...r.kernel.org
Cc:     andreyknvl@...gle.com, Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [Patch net v3] ipv6: check for ip6_null_entry in
 __ip6_del_rt_siblings()

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


Missed this earlier. The issue here is an attempt to delete the NULL
route, not that the null_entry is being returned as happens during a
route lookup. This will also hit the bug:
    ip -6 ro del ::/0