From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sasha Levin <levinsasha928@gmail.com>
Subject: Re: [PATCH 1/2] virtio-net: Verify page list size before fitting
 into skb
Date: Tue, 27 Sep 2011 14:20:29 +0300
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Cc: linux-kernel@vger.kernel.org,
	Rusty Russell <rusty@rustcorp.com.au>,
	virtualization@lists.linux-foundation.org, netdev@vger.kernel.org,
	kvm@vger.kernel.org
To: "Michael S. Tsirkin" <mst@redhat.com>
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List-Id: kvm.vger.kernel.org

On Tue, 2011-09-27 at 10:00 +0300, Michael S. Tsirkin wrote:
> >               skb = page_to_skb(vi, page, len);
> >               ...
> 
> Sorry I don't get it yet. Where is mergeable ignored here?

The NULL deref happens in page_to_skb(), before merge buffers are
handled.

I'll test it and see if it's really the case.

-- 

Sasha.