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Date:   Tue, 28 Feb 2017 15:14:40 -0800
From:   Eric Dumazet <>
To:     David Ahern <>
Cc:     Eric Dumazet <>,
        Dmitry Vyukov <>,
        David Miller <>,
        Hideaki YOSHIFUJI <>,
        netdev <>,
        LKML <>,
        Cong Wang <>,
        Yuchung Cheng <>,
        Willem de Bruijn <>,
        syzkaller <>
Subject: Re: net: GPF in rt6_nexthop_info

On Tue, Feb 28, 2017 at 3:09 PM, David Ahern <> wrote:
> On 2/28/17 5:10 AM, Eric Dumazet wrote:
>> David, rt->rt6i_idev can be NULL.
> Do you know of an example where rt6i_idev can be NULL - besides the
> null_entry rt which is null only because of init order?

I might have been mistaken, but many points in net/ipv6/route.c test
rt->rt6i_idev being NULL or not before dereferencing it.

Maybe other rts (other than null_entry) share this property.

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