问CUDA设备托管数据传输错误

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#include "cuda_runtime.h"
#include "device_launch_parameters.h"
#include <iostream>

int main()
{
int totalData = 20;
int *hostData;
hostData = new int[totalData];
std::cout<<std::endl<<std::endl<<"HostData Values : "<<std::endl;
for (int i=0; i<totalData ;i++)
{
    hostData[i]= i+1;
    std::cout<<hostData[i]<<" "; 
}

int *deviceData;
int *hostDataFinal;
cudaMalloc((void**)&deviceData,totalData*sizeof(int));
hostDataFinal = new int[totalData];

cudaMemcpy(deviceData,hostData,totalData,cudaMemcpyHostToDevice);
cudaMemcpy(hostDataFinal,deviceData,totalData,cudaMemcpyDeviceToHost);

std::cout<<std::endl<<std::endl<<"HostDataFinal After Device Transfer Values : "<<std::endl;
for (int i=0; i<totalData ;i++)
{
    std::cout<<hostDataFinal[i]<<" "; 
}

free(hostData);
free(hostDataFinal);
cudaFree(deviceData);
return 0;