netdev - Re: [PATCH] ipv6: fix null pointer dereference in __ip6addrlbl

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Message-ID: <20130903080425.GB2990@marquez.int.rhx>
Date:	Tue, 3 Sep 2013 09:04:25 +0100
From:	Michele Baldessari <michele@...syn.org>
To:	netdev@...r.kernel.org,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	"David S. Miller" <davem@...emloft.net>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: Re: [PATCH] ipv6: fix null pointer dereference in __ip6addrlbl_add

Hi Hannes,

On Tue, Sep 03, 2013 at 02:13:31AM +0200, Hannes Frederic Sowa wrote:
> On Mon, Sep 02, 2013 at 10:31:28PM +0100, Michele Baldessari wrote:
> > with the latest linux master git tree from Linus
> > (248d296d6d9df384996c2ed95676b367d876d48c - 2 Sep) I can reproduceably oops 
> > the kernel with the following commands:
> > ip addrlabel flush
> > ip addrlabel add prefix ::1/128              label 0
> > ip addrlabel add prefix ::/0                 label 1
> 
> Thanks for the report! This patch should fix this issue:
> 
> [PATCH] ipv6: fix null pointer dereference in __ip6addrlbl_add
> 
> Commit b67bfe0d42cac56c512dd5da4b1b347a23f4b70a ("hlist: drop
> the node parameter from iterators") changed the behavior of
> hlist_for_each_entry_safe to leave the p argument NULL.
> 
> Fix this up by tracking the last argument.
> 
> Reported-by: Michele Baldessari <michele@...syn.org>
> Cc: Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
> Cc: Sasha Levin <sasha.levin@...cle.com>
> Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>

Thanks for the patch, fixes it for me. 

Tested-by: Michele Baldessari <michele@...syn.org>
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