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Date:   Fri, 21 Aug 2020 10:05:16 -0600
From:   David Ahern <>
To:     Nikolay Aleksandrov <>,
        syzbot <>,,,,,,,
Subject: Re: general protection fault in fib_dump_info (2)

On 8/21/20 10:00 AM, Nikolay Aleksandrov wrote:
> This seems like a much older bug to me, the code allows to pass 0 groups
> and
> thus we end up without any nh_grp_entry pointers. I reproduced it with a
> modified iproute2 that sends an empty NHA_GROUP and then just uses the new
> nexthop in any way (e.g. add a route with it). This is the same bug as the
> earlier report for: "general protection fault in fib_check_nexthop"

hmmm.... empty NHA_GROUP should not be allowed.

> I have a patch but I'll be able to send it tomorrow.


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