Re: [PATCH] xen/gntdev: avoid out of bounds access in case of partial gntdev_mmap()

[Boris Ostrovsky]

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@xxxxxxxxxxxxxxx>
> Reported-by: Arthur Borsboom <arthurborsboom@xxxxxxxxx>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

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