netdev - Re: [PATCH][NEIGH]: Fix race between neighbor lookup and table's hash

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Message-Id: <20080223.195723.218310011.davem@davemloft.net>
Date:	Sat, 23 Feb 2008 19:57:23 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	xemul@...nvz.org
Cc:	netdev@...r.kernel.org, devel@...nvz.org
Subject: Re: [PATCH][NEIGH]: Fix race between neighbor lookup and table's
 hash_rnd update.

From: Pavel Emelyanov <xemul@...nvz.org>
Date: Fri, 22 Feb 2008 12:37:03 +0300

> The neigh_hash_grow() may update the tbl->hash_rnd value, which 
> is used in all tbl->hash callbacks to calculate the hashval.
> 
> Two lookup routines may race with this, since they call the 
> ->hash callback without the tbl->lock held. Since the hash_rnd
> is changed with this lock write-locked moving the calls to ->hash
> under this lock read-locked closes this gap.
> 
> Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>

Applied, thanks.
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