RDMA/pvrdma: Use ib_copy_validate_udata_in() for srq

struct pvrdma_create_srq was introduced when the driver was first
merged but was never used. At that point it had only buf_addr. Later
when SRQ was introduced the struct was expanded. So unlike the other
cases that grab the first struct member based on git blame this
uses the entire struct.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>

Author: jgunthorpe

drivers/infiniband/hw/vmw_pvrdma/pvrdma_cq.c

@@ -134,10 +134,9 @@ int pvrdma_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
 	cq->is_kernel = !udata;
 
 	if (!cq->is_kernel) {
-		if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
-			ret = -EFAULT;
+		ret = ib_copy_validate_udata_in(udata, ucmd, reserved);
+		if (ret)
 			goto err_cq;
-		}
 
 		cq->umem = ib_umem_get(ibdev, ucmd.buf_addr, ucmd.buf_size,
 				       IB_ACCESS_LOCAL_WRITE);