linux-kernel - Re: [PATCHv2] vhost-net: fix use-after-free in vhost_net

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Date:	Tue, 25 Jun 2013 17:12:55 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mst@...hat.com
Cc:	linux-kernel@...r.kernel.org, asias@...hat.com,
	jasowang@...hat.com, kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCHv2] vhost-net: fix use-after-free in vhost_net_flush

From: "Michael S. Tsirkin" <mst@...hat.com>
Date: Tue, 25 Jun 2013 17:29:46 +0300

> vhost_net_ubuf_put_and_wait has a confusing name:
> it will actually also free it's argument.
> Thus since commit 1280c27f8e29acf4af2da914e80ec27c3dbd5c01
>     "vhost-net: flush outstanding DMAs on memory change"
> vhost_net_flush tries to use the argument after passing it
> to vhost_net_ubuf_put_and_wait, this results
> in use after free.
> To fix, don't free the argument in vhost_net_ubuf_put_and_wait,
> add an new API for callers that want to free ubufs.
> 
> Acked-by: Asias He <asias@...hat.com>
> Acked-by: Jason Wang <jasowang@...hat.com>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>

This doesn't apply cleanly to the 'net' tree, please fix this up
and resubmit.

Thanks.
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