static int set_mlx_qp_type(struct mlx5_ib_dev *dev,
			   struct ib_qp_init_attr *init_attr,
			   struct mlx5_ib_create_qp *ucmd,
			   struct ib_udata *udata)
{
	enum { MLX_QP_FLAGS = MLX5_QP_FLAG_TYPE_DCT | MLX5_QP_FLAG_TYPE_DCI };
	int err;

	if (!udata)
		return -EINVAL;

	if (udata->inlen < sizeof(*ucmd)) {
		mlx5_ib_dbg(dev, "create_qp user command is smaller than expected\n");
		return -EINVAL;
	}
	err = ib_copy_from_udata(ucmd, udata, sizeof(*ucmd));
	if (err)
		return err;

	if ((ucmd->flags & MLX_QP_FLAGS) == MLX5_QP_FLAG_TYPE_DCI) {
		init_attr->qp_type = MLX5_IB_QPT_DCI;
	} else {
		if ((ucmd->flags & MLX_QP_FLAGS) == MLX5_QP_FLAG_TYPE_DCT) {
			init_attr->qp_type = MLX5_IB_QPT_DCT;
		} else {
			mlx5_ib_dbg(dev, "Invalid QP flags\n");
			return -EINVAL;
		}
	}

	if (!MLX5_CAP_GEN(dev->mdev, dct)) {
		mlx5_ib_dbg(dev, "DC transport is not supported\n");
		return -EOPNOTSUPP;
	}

	return 0;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.