On Mon, 21 Aug 2017 14:27:45 +0200
Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote:
> From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
>
> sthyi should only generate a specification exception if the function
> code is zero and the response buffer is not on a 4k boundary.
>
> The current code would also test for unknown function codes if the
> response buffer, that is currently only defined for function code 0,
> is not on a 4k boundary and incorrectly inject a specification
> exception instead of returning with condition code 3 and return code 4
> (unsupported function code).
>
> Fix this by moving the boundary check.
>
> Fixes: 95ca2cb57985 ("KVM: s390: Add sthyi emulation")
> Cc: <stable@xxxxxxxxxxxxxxx> # 4.8+
> Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
> Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> ---
> arch/s390/kvm/sthyi.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
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