From: Pavel Emelianov <xemul@sw.ru>
To: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Cc: David Miller <davem@davemloft.net>,
Linux Netdev List <netdev@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
devel@openvz.org, Patrick McHardy <kaber@trash.net>,
Kirill Korotaev <dev@openvz.org>
Subject: Re: [NETLINK] Don't attach callback to a going-away netlink socket
Date: Wed, 18 Apr 2007 12:32:40 +0400 [thread overview]
Message-ID: <4625D7A8.5030209@sw.ru> (raw)
In-Reply-To: <20070418081707.GA29267@2ka.mipt.ru>
Evgeniy Polyakov wrote:
> On Wed, Apr 18, 2007 at 12:16:18PM +0400, Pavel Emelianov (xemul@sw.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
Error path is not relevant here. The problem is that we
keep a calback on a socket that is about to be freed.
> 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.
>
next prev parent reply other threads:[~2007-04-18 8:27 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-18 8:16 [NETLINK] Don't attach callback to a going-away netlink socket Pavel Emelianov
2007-04-18 8:17 ` Evgeniy Polyakov
2007-04-18 8:26 ` Patrick McHardy
2007-04-18 8:42 ` Evgeniy Polyakov
2007-04-18 8:50 ` Patrick McHardy
2007-04-18 9:07 ` Evgeniy Polyakov
2007-04-18 9:16 ` Patrick McHardy
2007-04-18 9:29 ` Evgeniy Polyakov
2007-04-18 8:32 ` Pavel Emelianov [this message]
2007-04-18 8:44 ` Evgeniy Polyakov
2007-04-18 9:03 ` Pavel Emelianov
2007-04-18 9:14 ` Evgeniy Polyakov
2007-04-19 0:06 ` David Miller
2007-04-19 2:13 ` Herbert Xu
2007-04-29 6:18 ` David Miller
2007-05-02 4:12 ` Herbert Xu
2007-05-03 10:17 ` David Miller
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