netdev - Re: [PATCH net] net: fix a race in dst

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Message-Id: <20151109.215639.72685911796993165.davem@davemloft.net>
Date:	Mon, 09 Nov 2015 21:56:39 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, gthelen@...gle.com
Subject: Re: [PATCH net] net: fix a race in dst_release()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 09 Nov 2015 17:51:23 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Only cpu seeing dst refcount going to 0 can safely
> dereference dst->flags. 
> 
> Otherwise an other cpu might already have freed the dst.
> 
> Fixes: 27b75c95f10d ("net: avoid RCU for NOCACHE dst")
> Reported-by: Greg Thelen <gthelen@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Ouch...

Applied and queued up for -stable, thanks.
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