使用 strdup 进行堆损坏

问题描述

我将 VTK 与 MSVC 一起使用，并在尝试加载数据时出现奇怪的行为.我对它进行了一些修改，即使是以下代码也会产生堆损坏，您知道发生了什么或可能出了什么问题吗?

I am using VTK together with MSVC and get a strange behaviour when trying to load data. I tinkered a little bit with it and even the following code generates a heap corruption, any ideas what is happening or what possibly went wrong?

vtkAbstractArray *vtkDataReader::ReadArray(const char *dataType, int numTuples, int numComp)
{

  char* type=strdup(dataType);

  free(type); // <--- here the heap corrution appears

  ...

这是调用堆栈:

>   msvcr90d.dll!_CrtIsValidHeapPointer(const void * pUserData=0x00691da0)  Zeile 2103  C++
    msvcr90d.dll!_free_dbg_nolock(void * pUserData=0x00691da0, int nBlockUse=1)  Zeile 1317 + 0x9 Bytes C++
    msvcr90d.dll!_free_dbg(void * pUserData=0x00691da0, int nBlockUse=1)  Zeile 1258 + 0xd Bytes    C++
    msvcr90d.dll!free(void * pUserData=0x00691da0)  Zeile 49 + 0xb Bytes    C++
    Simulator.exe!vtkDataReader::ReadArray(const char * dataType=0x0370b734, int numTuples=24576, int numComp=3)  Zeile 1401 + 0xc Bytes    C++
    Simulator.exe!vtkDataReader::ReadPoints(vtkPointSet * ps=0x081702d0, int numPts=24576)  Zeile 1936 + 0x15 Bytes C++

使用此代码代替 strdup 效果很好，strdup 是否在 msvc 上以某种方式损坏?

using this code instead of strdup works nicely, is strdup somehow broken on msvc?

char *type=(char*)malloc(100);
strcpy(type,dataType);

推荐答案

strdup 本身在 msvc 中已被弃用，并且网上有类似堆损坏的报告，微软表示您应该改用 _strdup

strdup as such is deprecated in msvc and there are reports of similar heap corruption around the web, microsoft states you should use _strdup instead

http://msdn.microsoft.com/en-us/library/ms235454

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