RDMA/mlx5: Use ib_copy_validate_udata_in() for SRQ

flags is the last member for mlx5_ib_create_srq, the uidx is a
later extension.

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

Author: jgunthorpe

drivers/infiniband/hw/mlx5/srq.c

@@ -48,25 +48,16 @@ static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
 	struct mlx5_ib_create_srq ucmd = {};
 	struct mlx5_ib_ucontext *ucontext = rdma_udata_to_drv_context(
 		udata, struct mlx5_ib_ucontext, ibucontext);
-	size_t ucmdlen;
 	int err;
 	u32 uidx = MLX5_IB_DEFAULT_UIDX;
 
-	ucmdlen = min(udata->inlen, sizeof(ucmd));
-
-	if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
-		mlx5_ib_dbg(dev, "failed copy udata\n");
-		return -EFAULT;
-	}
+	err = ib_copy_validate_udata_in(udata, ucmd, flags);
+	if (err)
+		return err;
 
 	if (ucmd.reserved0 || ucmd.reserved1)
 		return -EINVAL;
 
-	if (udata->inlen > sizeof(ucmd) &&
-	    !ib_is_udata_cleared(udata, sizeof(ucmd),
-				 udata->inlen - sizeof(ucmd)))
-		return -EINVAL;
-
 	if (in->type != IB_SRQT_BASIC) {
 		err = get_srq_user_index(ucontext, &ucmd, udata->inlen, &uidx);
 		if (err)