linux-kernel - Re: [PATCH net] net: neigh: guard against NULL solicit() method

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Date:   Thu, 23 Mar 2017 21:28:49 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     edumazet@...gle.com, dvyukov@...gle.com, xiyou.wangcong@...il.com,
        herbert@...dor.apana.org.au, ast@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller@...glegroups.com
Subject: Re: [PATCH net] net: neigh: guard against NULL solicit() method

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 23 Mar 2017 12:39:21 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Dmitry posted a nice reproducer of a bug triggering in neigh_probe()
> when dereferencing a NULL neigh->ops->solicit method.
> 
> This can happen for arp_direct_ops/ndisc_direct_ops and similar,
> which can be used for NUD_NOARP neighbours (created when dev->header_ops
> is NULL). Admin can then force changing nud_state to some other state
> that would fire neigh timer.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>

Applied and queued up for -stable, thanks Eric.