LocalFree fails - HELP! (Again)

From:

billyard <dmetcalf@columbus.rr.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Thu, 27 Dec 2007 21:08:09 -0500

Message-ID:

<47745a84$0$7206$4c368faf@roadrunner.com>

If I don't execute the LocalFree functions - memory leak.

If I do execute ALL the LocalFree functions - program dies.

Without my "LocalFree" problems - the program works perfectly.

I know I'm doing something stupid. There is some extraneous code in here
that is due to my testing. I left it in. Once again, Thank you in advance!

Here's the code.

CString CChildView::DecryptPOP3Password(BYTE* ppData, DWORD pBytes)
{
    // Get the hard drive's serial number - used for encryption purposes.
    CHardDriveInfo hardDriveInfo;
    hardDriveInfo.InitDriveInfo();
    CString strPassword;

    DATA_BLOB DataEntropy;
    DATA_BLOB DataOut;
    DATA_BLOB EncData;

    LPWSTR description;

    DataEntropy.pbData = (BYTE*)hardDriveInfo.HardDriveSerialNumber;
    DataEntropy.cbData = (DWORD)strlen((char*)
hardDriveInfo.HardDriveSerialNumber);

    EncData.cbData = pBytes;
    EncData.pbData = ppData;

    if(CryptUnprotectData(
        &EncData,
        &description,
        &DataEntropy,
        NULL,
        NULL,
        CRYPTPROTECT_LOCAL_MACHINE,
        &DataOut))
    {
       TRACE0("Successful\n");

    }
    else
    {
       TRACE0("Failed\n");
    }
    strPassword = DataOut.pbData;

    HLOCAL MyLocalMemory;
    DWORD LastError;
    MyLocalMemory = LocalFree(description); // This works fine
    if (NULL != MyLocalMemory)
       LastError = GetLastError();

    MyLocalMemory = LocalFree(DataOut.pbData); // This works fine
    if (NULL != MyLocalMemory)
       LastError = GetLastError();

    MyLocalMemory = LocalFree(&hardDriveInfo); // DOESN'T WORK
    if (NULL != MyLocalMemory)
    {
       LastError = GetLastError();
       TRACE1("failed with error %d", LastError);
    }
    MyLocalMemory = LocalFree(EncData.pbData); // THIS FAILS - CORRUPT
                                                  // HEAP - STOPS PROGRAM

    MyLocalMemory = LocalFree(DataEntropy.pbData);
    if (NULL != MyLocalMemory)
    {
       LastError = GetLastError();
       TRACE1("failed with error %d", LastError);
    }
    return strPassword;
}