linux-kernel - Re: [PATCH] xen/gntdev: avoid out of bounds access in case of partial gntdev

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Message-ID: <11e7d8e0-3cc3-3266-c799-a2b30b1636ad@oracle.com>
Date:   Wed, 25 Oct 2017 12:46:37 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Cc:     stable@...r.kernel.org
Subject: Re: [PATCH] xen/gntdev: avoid out of bounds access in case of partial
 gntdev_mmap()

On 10/25/2017 11:08 AM, Juergen Gross wrote:
> In case gntdev_mmap() succeeds only partially in mapping grant pages
> it will leave some vital information uninitialized needed later for
> cleanup. This will lead to an out of bounds array access when unmapping
> the already mapped pages.
>
> So just initialize the data needed for unmapping the pages a little bit
> earlier.
>
> Cc: <stable@...r.kernel.org>
> Reported-by: Arthur Borsboom <arthurborsboom@...il.com>
> Signed-off-by: Juergen Gross <jgross@...e.com>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>