Forum posts for netmon.exe

[Can't figure out]Memory allocation/freeing error (extremely small code)

While running the code listed at the end, i get a break at the last line FREE(pTcpTable); and if i continue this error shows up:

'Unhandled exception at 0x7737096E (ntdll.dll) in netMon.exe: 0xC0000005: Access violation reading location 0x00000009.'

crt0dat.c opens and this code is shown:

void __cdecl __crtExitProcess (
int status
)
{
__crtCorExitProcess(status);

/*
* Either mscoree.dll isn't loaded,
* or CorExitProcess isn't exported from mscoree.dll,
* or CorExitProcess returned (should never happen).
* Just call ExitProcess.
*/

ExitProcess(status);
}


This is the code:

#include <iostream>
#include <WinSock2.h>
#include <IPHlpApi.h>
#include <Ws2tcpip.h>

using namespace std;

#pragma comment(lib, 'iphlpapi.lib')
#pragma comment(lib, 'ws2_32.lib')

#define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x))
#define FREE(x) HeapFree(GetProcessHeap(), 0, (x))

int __cdecl main()
{
PMIB_TCPTABLE_OWNER_PID pTcpTable;
DWORD tcpTableSize = 0;

char szLocalAddr[128];

struct in_addr IpAddr;

pTcpTable = (PMIB_TCPTABLE_OWNER_PID)MALLOC(sizeof(MIB_TCPTABLE_OWNER_PID));

if(pTcpTable == NULL)
return 1;

tcpTableSize = sizeof(MIB_TCPTABLE_OWNER_PID);

if(GetExtendedTcpTable(pTcpTable, &tcpTableSize, FALSE, AF_INET, TCP_TABLE_OWNER_PID_CONNECTIONS, 0) == ERROR_INSUFFICIENT_BUFFER)
{
FREE(pTcpTable);

pTcpTable = (PMIB_TCPTABLE_OWNER_PID)MALLOC(sizeof(tcpTableSize));

if(pTcpTable == NULL)
return 1;
}

if(GetExtendedTcpTable(pTcpTable, &tcpTableSize, FALSE, AF_INET, TCP_TABLE_OWNER_PID_CONNECTIONS, 0) == NO_ERROR)
{
for(DWORD i = 0; i < pTcpTable->dwNumEntries; i++)
{
IpAddr.S_un.S_addr = (u_long)pTcpTable->table[i].dwRemoteAddr;

InetNtop(AF_INET, &IpAddr, szLocalAddr, 128);
}
}

if(pTcpTable != NULL)
FREE(pTcpTable);

return 0;
}


I can't figure out whats wrong here, its simple memory allocation and deallocation, kindly help me out here!

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