linux-kernel - Re: [PATCH 1/2] virtio-net: Verify page list size before fitting into skb

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Message-ID: <1317122429.3467.5.camel@lappy>
Date:	Tue, 27 Sep 2011 14:20:29 +0300
From:	Sasha Levin <levinsasha928@...il.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	kvm@...r.kernel.org
Subject: Re: [PATCH 1/2] virtio-net: Verify page list size before fitting
 into skb

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.

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