netdev - Re: [PATCH net] rtnetlink: Refine sanity checks in rtnl_fdb

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Date:   Fri, 30 Nov 2018 08:36:11 -0700
From:   David Ahern <dsahern@...il.com>
To:     Ido Schimmel <idosch@...sch.org>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        syzbot <syzkaller@...glegroups.com>,
        Ido Schimmel <idosch@...lanox.com>
Subject: Re: [PATCH net] rtnetlink: Refine sanity checks in rtnl_fdb_{add|del}

On 11/30/18 7:58 AM, Ido Schimmel wrote:
> Can you please share the reproducer (assuming it exists)? I don't really
> understand the fix. None of the functions you patched are in the trace.
> Also, looking at IPv4 GRE code, while GRE device has dev->addr_len set
> to 4, dev->type is set to ARPHRD_IPGRE.

I had the same reaction ... you can not claim to be an ethernet device
and have a hw address that is not 6 bytes.