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

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Message-ID: <4625E202.8040604@trash.net>
Date:	Wed, 18 Apr 2007 11:16:50 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
CC:	Pavel Emelianov <xemul@...ru>, 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, Kirill Korotaev <dev@...nvz.org>
Subject: Re: [NETLINK] Don't attach callback to a going-away netlink socket

Evgeniy Polyakov wrote:
> On Wed, Apr 18, 2007 at 10:50:42AM +0200, Patrick McHardy (kaber@...sh.net) wrote:
> 
>>>I thought that with releasing a socket, which will have a callback
>>>attached only results in a leak of the callback? In that case we can
>>>just free it in dump() just like it is done in no-error path already.
>>>Or do I miss something additional?
>>
>>That would only work if there is nothing to dump (cb->dump returns 0).
>>Otherwise it is not freed.
> 
> 
> That is what I referred to as error path. Btw, with positive return
> value we end up in subsequent call to input which will free callback
> under lock as expected.


No, nothing is going to call netlink_dump after the initial call since
the socket is gone.

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