On Thu, Nov 08, 2018 at 09:41:00AM +0100, Janosch Frank wrote:
> From: Janosch Frank <frankja@xxxxxxxxxx>
>
> Userspace could have munmapped the area before doing unmapping from the
> gmap. This would leave us with a valid vmaddr, but an invalid vma from
> which we would try to zap memory.
>
> Let's check before using the vma.
>
> Fixes: 1e133ab296f3 ("s390/mm: split arch/s390/mm/pgtable.c")
> Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
> Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> CC: stable@xxxxxxxxxxxxxxx # 4.6+
> ---
> arch/s390/mm/gmap.c | 2 ++
> 1 file changed, 2 insertions(+)
Please always include the upstream git commit id so that I have a clue
as to what it is when doing the backport.
thanks,
greg k-h
