netdev - Re: [PATCH] l2tp: fix a race in l2tp_ip

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Message-Id: <20120608.143147.1838350639362568199.davem@davemloft.net>
Date:	Fri, 08 Jun 2012 14:31:47 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, jchapman@...alix.com, denys@...p.net.lb
Subject: Re: [PATCH] l2tp: fix a race in l2tp_ip_sendmsg()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 08 Jun 2012 18:25:00 +0200

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Commit 081b1b1bb27f (l2tp: fix l2tp_ip_sendmsg() route handling) added
> a race, in case IP route cache is disabled.
> 
> In this case, we should not do the dst_release(&rt->dst), since it'll
> free the dst immediately, instead of waiting a RCU grace period.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Working with a zero-ref'd object is always playing with fire even
when we "know what we are doing" :-)

Applied and queued up for -stable, thanks Eric.
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