linux-kernel - Re: [PATCH net] tun: fix recovery from gup errors

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Message-ID: <20130624113113.GA25233@hmsreliant.think-freely.org>
Date:	Mon, 24 Jun 2013 07:31:13 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Jason Wang <jasowang@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
	Brad Hubbard <bhubbard@...hat.com>
Subject: Re: [PATCH net] tun: fix recovery from gup errors

On Sun, Jun 23, 2013 at 05:19:03PM +0300, Michael S. Tsirkin wrote:
> get user pages might fail partially in tun zero copy
> mode. To recover we need to put all pages that we got,
> but code used a wrong index resulting in double-free
> errors.
> 
> Reported-by: Brad Hubbard <bhubbard@...hat.com>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
> 
> I haven't figured out why do we get failures,
> but recovery is clearly wrong.
> 
> This is also -stable material.
> 
>  drivers/net/tun.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
Acked-by: Neil Horman <nhorman@...driver.com>

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