netdev - Re: [PATCH net-next v2] net: Add sysctl to toggle early demux for tcp and udp

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Date:   Fri, 10 Mar 2017 00:34:54 -0700
From:   Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     netdev@...r.kernel.org,
        Stephen Hemminger <stephen@...workplumber.org>,
        netdev-owner@...r.kernel.org
Subject: Re: [PATCH net-next v2] net: Add sysctl to toggle early demux for tcp
 and udp

> Well, then you need to make sure ipprot->early_demux is read once in 
> the
> callers, like ip_rcv_finish(), otherwise compiler could read it twice
> and we could deref a NULL pointer.
> 
> ipprot = rcu_dereference(inet_protos[protocol]);
> if (ipprot && ipprot->early_demux) {
>     ipprot->early_demux(skb);   // crash

Thanks Eric. I'll update this.

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