Adds proper sanity on virtual cdm right operation to avoid
OOB register space access. After getting the mapped buffers
through cam_mem_get_cpu_buf() in kernel, userspace is still
able to access those buffers. So, the validation of offsets
and sizes does not have any advantage if userspace can alter
those parameters after we have validated them. That's why we
copied the information in kernel before we validate that.
CRs-Fixed: 3778045
Change-Id: I3b53549419b40a92333263e29d93220577d691e9
Signed-off-by: Yash Upadhyay <quic_yupadhya@quicinc.com>
d6d05fba0b