netdev - Re: Crash with SO_REUSEPORT and ef456144da8ef507c8cf504284b6042e9201a05c

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Message-ID: <CAB9dFdsVxzi_Tx2yvStXLr2qvqd4ht4H1BRM8A5E1x-cBMv4mg@mail.gmail.com>
Date:	Tue, 19 Jan 2016 13:08:27 -0400
From:	Marc Dionne <marc.c.dionne@...il.com>
To:	Craig Gallek <kraig@...gle.com>
Cc:	netdev <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: Crash with SO_REUSEPORT and ef456144da8ef507c8cf504284b6042e9201a05c

On Tue, Jan 19, 2016 at 12:31 PM, Craig Gallek <kraig@...gle.com> wrote:
>
> I need to think about how to handle setsockopt-after-bind condition a
> bit more, but the NULL pointer dereference is obviously wrong.  Do you
> have a way to easily reproduce this?  I've only managed to get it to
> happen once so far...

The attached code reliably triggers the crash for me.

View attachment "reuseport_crash.c" of type "text/x-csrc" (911 bytes)