[PATCH for-4.5] arm/kvm: fix ioctl error handling

[Christoffer Dall]

On Sun, Feb 28, 2016 at 05:32:07PM +0200, Michael S. Tsirkin wrote:
> Calling return copy_to_user(...) in an ioctl will not
> do the right thing if there's a pagefault:
> copy_to_user returns the number of bytes not copied
> in this case.
> 
> Fix up kvm to do
> 	return copy_to_user(...)) ?  -EFAULT : 0;
> 
> everywhere.
> 
> Cc: stable at vger.kernel.org
> Signed-off-by: Michael S. Tsirkin <mst at redhat.com>

Acked-by: Christoffer Dall <christoffer.dall at linaro.org>