netdev - Re: ip_rcv_finish() NULL pointer kernel panic

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Message-ID: <1485453601.5145.142.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Thu, 26 Jan 2017 10:00:01 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Florian Westphal <fw@...len.de>
Cc:     Roy Keene <lkml@...ene.org>, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org
Subject: Re: ip_rcv_finish() NULL pointer kernel panic

On Thu, 2017-01-26 at 17:24 +0100, Florian Westphal wrote:

> I think it makes sense to set dst->incoming
> to a stub in br_netfilter_rtable_init() to just kfree_skb()+
> WARN_ON_ONCE(), no need to add code to ip stack or crash kernel
> due to brnf bug.

Just kfree_skb() would hide bugs.

Dropping packets is not uncommon in networking...

I would rather use at least a WARN_ON_ONCE() before the kfree_skb() ;)