netdev - Re: general protection fault in fib_dump

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Date:   Fri, 21 Aug 2020 10:05:16 -0600
From:   David Ahern <dsahern@...il.com>
To:     Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        syzbot <syzbot+a61aa19b0c14c8770bd9@...kaller.appspotmail.com>,
        davem@...emloft.net, kuba@...nel.org, kuznet@....inr.ac.ru,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, yoshfuji@...ux-ipv6.org
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.
> 

thanks.