linux-kernel - Re: [PATCH net-next 3/3] nftables: Convert nft

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Message-ID: <20140801145145.GE7331@casper.infradead.org>
Date:	Fri, 1 Aug 2014 15:51:45 +0100
From:	Thomas Graf <tgraf@...g.ch>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Nikolay Aleksandrov <nikolay@...hat.com>, davem@...emloft.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	paulmck@...ux.vnet.ibm.com, josh@...htriplett.org,
	challa@...ronetworks.com, walpole@...pdx.edu, dev@...nvswitch.org,
	tklauser@...tanz.ch, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH net-next 3/3] nftables: Convert nft_hash to use generic
 rhashtable

On 08/01/14 at 03:12pm, Patrick McHardy wrote:
> On 1. August 2014 14:49:01 GMT+01:00, Thomas Graf <tgraf@...g.ch> wrote:
> >On 08/01/14 at 02:21pm, Nikolay Aleksandrov wrote:
> >> Sorry for the late response but I just got around to check the 3rd
> >patch now,
> >> so my question about this fragment is: before nft_hash_remove() would
> >free the
> >> element after removal, but after this change I don't see where and
> >when the
> >> removed element would get freed ?
> >
> >You are right. Looking at this closer we were leaking references even
> >before the change because it would not call nft_data_uninit() to
> >release
> >the data objects. So it should really just call
> >nft_hash_elem_destroy().
> 
> No, the data uninit is performed by the set core. Just freeing it is fine.

OK, I can see the uninit on the data in nft_del_setelem() for maps
prior to the actual commit. The location is slightly unexpected since
the element is still findable in the hash table at that point.

I'll wait a short while to see if there is more feedback and resubmit
afterwards.
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