linux-kernel - Re: rhashtable: warnings caused by "rhashtable: Fix use-after-free in rhashtable_walk

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Date:	Mon, 23 Mar 2015 22:16:24 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	sasha.levin@...cle.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, tgraf@...g.ch
Subject: Re: rhashtable: warnings caused by "rhashtable: Fix use-after-free
 in rhashtable_walk_stop"

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Tue, 24 Mar 2015 09:53:17 +1100

> rhashtable: Fix sleeping inside RCU critical section in walk_stop
> 
> The commit 963ecbd41a1026d99ec7537c050867428c397b89 ("rhashtable:
> Fix use-after-free in rhashtable_walk_stop") fixed a real bug
> but created another one because we may end up sleeping inside an
> RCU critical section.
> 
> This patch fixes it properly by replacing the mutex with a spin
> lock that specifically protects the walker lists.
> 
> Reported-by: Sasha Levin <sasha.levin@...cle.com>
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Applied, thanks everyone.
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