multiple calls to realloc() seems to cause a heap corruption..
- by Windindeed
What's the problem with this code? It crashes every time.
One time it's a failed assertion "_ASSERTE(_CrtIsValidHeapPointer(pUserData));", other times it is just a "heap corrpuption" error.
Changing the buffer size affects this issue in some strange ways - sometimes it crashes on the "realloc", and other times on the "free".
I have debugged this code many times, and there is nothing abnormal regarding the pointers.
char buf[2000];
char *data = (char*)malloc(sizeof(buf));
unsigned int size = sizeof(buf);
for (unsigned int i = 0; i < 5; ++i)
{
char *ptr = data + size;
size += sizeof(buf);
char *tmp = (char*)realloc(data, size);
if (!tmp)
{
std::cout << "Oh no..";
break;
}
data = tmp;
memcpy(ptr, buf, sizeof(buf));
}
free(data);
Thanks!
