linux-kernel - Re[2]: [PATCH] netfilter: ipvs: Verify that IP

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Date:	Fri, 6 Apr 2012 10:59:23 +0200 (CEST)
From:	"Hans Schillstrom" <hans@...illstrom.com>
To:	"Simon Horman" <horms@...ge.net.au>
Cc:	"Sasha Levin" <levinsasha928@...il.com>, wensong@...ux-vs.org,
	ja@....bg, kaber@...sh.net, davem@...emloft.net, davej@...hat.com,
	netdev@...r.kernel.org, lvs-devel@...r.kernel.org,
	netfilter-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re[2]:  [PATCH] netfilter: ipvs: Verify that IP_VS protocol 
	has been registered

Hello Simon

>---- Original Message ----
>From: Simon Horman <horms@...ge.net.au>
>To: "Sasha Levin" <levinsasha928@...il.com>
>Cc: wensong@...ux-vs.org, ja@....bg, kaber@...sh.net, davem@...emloft.net, davej@...hat.com, netdev@...r.kernel.org, lvs-devel@...r.kernel.org, netfilter-devel@...r.kernel.org, linux-kernel@...r.kernel.org
>Sent: Fri, Apr 6, 2012, 1:19 AM
>Subject: Re: [PATCH] netfilter: ipvs: Verify that IP_VS protocol has been registered
>
>On Thu, Apr 05, 2012 at 07:24:33PM -0400, Sasha Levin wrote:
>> The registration of a protocol might fail, there were no checks
>> and all registrations were assumed to be correct. This lead to
>> NULL ptr dereferences when apps tried registering.
>
>Thanks, I will queue up this fix.
>
>Do you have a real-world example of this failing, if so it
>might be worth pushing your change into stable.

I don't think this is a big thing, the only thing that can cause it is out of memory,
and that will cause a "kernel death" anyway :-(

here is the code :

register_ip_vs_proto_netns(struct net *net, struct ip_vs_protocol *pp)
{
...
	struct ip_vs_proto_data *pd =
			kzalloc(sizeof(struct ip_vs_proto_data), GFP_ATOMIC);

	if (!pd)
		return -ENOMEM;


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