netdev - Re: [PATCH] netlink: use kfree_rcu() in netlink

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Date:	Thu, 18 Oct 2012 15:36:16 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, marcheu@...gle.com, kliegs@...gle.com,
	sleffler@...gle.com
Subject: Re: [PATCH] netlink: use kfree_rcu() in netlink_release()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 18 Oct 2012 15:21:55 +0200

> From: Eric Dumazet <edumazet@...gle.com>
> 
> On some suspend/resume operations involving wimax device, we have
> noticed some intermittent memory corruptions in netlink code.
> 
> Stéphane Marchesin tracked this corruption in netlink_update_listeners()
> and suggested a patch.
> 
> It appears netlink_release() should use kfree_rcu() instead of kfree()
> for the listeners structure as it may be used by other cpus using RCU
> protection.
> 
> netlink_release() must set to NULL the listeners pointer when
> it is about to be freed.
> 
> Also have to protect netlink_update_listeners() and
> netlink_has_listeners() if listeners is NULL.
> 
> Add a nl_deref_protected() lockdep helper to properly document which
> locks protects us.
> 
> Reported-by: Jonathan Kliegman <kliegs@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied and queued up for -stable.
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