netdev - Re: [PATCH 2/2] IPVS: make failure of netns init more stable

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Message-ID: <201204161945.16182.hans.schillstrom@ericsson.com>
Date:	Mon, 16 Apr 2012 19:45:15 +0200
From:	Hans Schillstrom <hans.schillstrom@...csson.com>
To:	Julian Anastasov <ja@....bg>
CC:	"horms@...ge.net.au" <horms@...ge.net.au>,
	"wensong@...ux-vs.org" <wensong@...ux-vs.org>,
	"lvs-devel@...r.kernel.org" <lvs-devel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
	"hans@...illstrom.com" <hans@...illstrom.com>
Subject: Re: [PATCH 2/2] IPVS: make failure of netns init more stable

On Monday 16 April 2012 19:31:40 Julian Anastasov wrote:
> 
> 	Hello,
> 
> On Mon, 16 Apr 2012, Hans Schillstrom wrote:
> 
> > > 	But I see some inconsistency in net/core/net_namespace.c:
> > > __register_pernet_operations when CONFIG_NET_NS is enabled
> > > does not call ops_free after failed ops_init while when
> > > CONFIG_NET_NS is not enabled ops_free is called. The 
> > > problem is that we leak the ops->size data allocated for the
> > > failed net. I think, the fix should be ops_init to free the data.
> > 
> > Are you sure ?
> > In my code it does... 
> > 
> > static int __register_pernet_operations(struct list_head *list,
> > 					struct pernet_operations *ops)
> > at line 417
> > ..
> > 		for_each_net(net) {
> > 			error = ops_init(ops, net);
> > 			if (error)
> > 				goto out_undo;
> 
> 	There is line here that registers current net for
> cleanup only after ops_init success:
> 
> 	list_add_tail(&net->exit_list, &net_exit_list);
> 
> 	If ops_init fails for first net then net_exit_list will
> be empty.

Yes, you are right as allways :-)

> 
> > ...
> > line 426
> > out_undo:
> > 	/* If I have an error cleanup all namespaces I initialized */
> > 	list_del(&ops->list);
> > 	ops_exit_list(ops, &net_exit_list);
> > 	ops_free_list(ops, &net_exit_list);
> > 	return error;
> > }
> 
> Regards
> 
> --
> Julian Anastasov <ja@....bg>
> 

-- 
Regards
Hans Schillstrom <hans.schillstrom@...csson.com>
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