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Date:   Mon, 16 Mar 2020 18:00:41 +0100
From:   Petr Machata <>
To:     syzbot <>
Subject: Re: general protection fault in erspan_netlink_parms

I've got this reproduced, it happens when IFLA_INFO_DATA is not passed,
so "ip link add type erspan". The problem is that the commit referenced
below doesn't check data != NULL in the ERSPAN branch. I'll send a fix
later today.

syzbot <> writes:

> syzbot has bisected this bug to:
> commit e1f8f78ffe9854308b9e12a73ebe4e909074fc33
> Author: Petr Machata <>
> Date:   Fri Mar 13 11:39:36 2020 +0000
>     net: ip_gre: Separate ERSPAN newlink / changelink callbacks
> bisection log:
> start commit:   0fda7600 geneve: move debug check after netdev unregister
> git tree:       net
> final crash:
> console output:
> kernel config:
> dashboard link:
> syz repro:
> C reproducer:
> Reported-by:
> Fixes: e1f8f78ffe98 ("net: ip_gre: Separate ERSPAN newlink / changelink callbacks")
> For information about bisection process see:

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