We need to validate the offset to make sure that we don't write after the BO.

Additional to that a page should be enough and can make address space
handling much easier.
Signed-off-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>