RDMA/mlx4: Use ib_copy_validate_udata_in() for QP

Move the validation of the udata to the same function that copies it.

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

Author: jgunthorpe

drivers/infiniband/hw/mlx4/qp.c

@@ -854,7 +854,6 @@ static int create_rq(struct ib_pd *pd, struct ib_qp_init_attr *init_attr,
 	unsigned long flags;
 	int range_size;
 	struct mlx4_ib_create_wq wq;
-	size_t copy_len;
 	int shift;
 	int n;
 
@@ -867,12 +866,9 @@ static int create_rq(struct ib_pd *pd, struct ib_qp_init_attr *init_attr,
 
 	qp->state = IB_QPS_RESET;
 
-	copy_len = min(sizeof(struct mlx4_ib_create_wq), udata->inlen);
-
-	if (ib_copy_from_udata(&wq, udata, copy_len)) {
-		err = -EFAULT;
+	err = ib_copy_validate_udata_in(udata, wq, comp_mask);
+	if (err)
 		goto err;
-	}
 
 	if (wq.comp_mask || wq.reserved[0] || wq.reserved[1] ||
 	    wq.reserved[2]) {
@@ -4112,26 +4108,11 @@ struct ib_wq *mlx4_ib_create_wq(struct ib_pd *pd,
 	struct mlx4_dev *dev = to_mdev(pd->device)->dev;
 	struct ib_qp_init_attr ib_qp_init_attr = {};
 	struct mlx4_ib_qp *qp;
-	struct mlx4_ib_create_wq ucmd;
-	int err, required_cmd_sz;
+	int err;
 
 	if (!udata)
 		return ERR_PTR(-EINVAL);
 
-	required_cmd_sz = offsetof(typeof(ucmd), comp_mask) +
-			  sizeof(ucmd.comp_mask);
-	if (udata->inlen < required_cmd_sz) {
-		pr_debug("invalid inlen\n");
-		return ERR_PTR(-EINVAL);
-	}
-
-	if (udata->inlen > sizeof(ucmd) &&
-	    !ib_is_udata_cleared(udata, sizeof(ucmd),
-				 udata->inlen - sizeof(ucmd))) {
-		pr_debug("inlen is not supported\n");
-		return ERR_PTR(-EOPNOTSUPP);
-	}
-
 	if (udata->outlen)
 		return ERR_PTR(-EOPNOTSUPP);