netdev - Re: [NETLINK] Don't attach callback to a going-away netlink socket

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Message-ID: <20070418081707.GA29267@2ka.mipt.ru>
Date:	Wed, 18 Apr 2007 12:17:07 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Pavel Emelianov <xemul@...ru>
Cc:	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	devel@...nvz.org, Patrick McHardy <kaber@...sh.net>,
	Kirill Korotaev <dev@...nvz.org>
Subject: Re: [NETLINK] Don't attach callback to a going-away netlink socket

On Wed, Apr 18, 2007 at 12:16:18PM +0400, Pavel Emelianov (xemul@...ru) wrote:
> Sorry, I forgot to put netdev and David in Cc when I first sent it.
> 
> There is a race between netlink_dump_start() and netlink_release()
> that can lead to the situation when a netlink socket with non-zero
> callback is freed.

Out of curiosity, why not to fix a netlink_dump_start() to remove
callback in error path, since in 'no-error' path it removes it in
netlink_dump().

And, btw, can release method be called while socket is being used, I
thought about proper reference counters should prevent this, but not
100% sure with RCU dereferencing of the descriptor.

-- 
	Evgeniy Polyakov
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