Locked memory?

  DWORD CALLBACK FindValue(LPVOID lpParam)
{
	MEMORY_BASIC_INFORMATION m;
	int nMatches = 0;
	LPSEARCHINFO s = (LPSEARCHINFO)lpParam;
	DWORD br, dwRegionSize, tmp;
	char lpTxt[100];
	unsigned char *lpSearchBuffer;

	VirtualQueryEx(s->hProcess, (void *)0x00400000, &m, sizeof m);
	dwRegionSize = m.RegionSize;
	for(int i=(int)m.BaseAddress;i<0x80000000;i+=m.RegionSize)
	{
		VirtualQueryEx(s->hProcess, (void *)i, &m, sizeof m);
		if(m.Protect != PAGE_NOACCESS)
		{
			lpSearchBuffer = new unsigned char[m.RegionSize];
			ReadProcessMemory(s->hProcess, m.BaseAddress, lpSearchBuffer, m.RegionSize, &br);
			if(br)
			{
				tmp = br - s->nSize;
				for(DWORD j=0;j<=tmp;j++)
				{
					if(!memcmp(lpSearchBuffer+j, &s->dwValue, s->nSize))
					{
						nMatches++;
						sprintf(lpTxt, "%x", i+j);
						SendDlgItemMessage(s->hWnd, IDC_MATCHES, LB_ADDSTRING, 0, (LPARAM)lpTxt);
					}
				}
			}
			delete [] lpSearchBuffer;
		}
		SendDlgItemMessage(s->hWnd, IDC_PROGRESS1, PBM_STEPIT, 0, 0);
	}

	sprintf(lpTxt, "Found %d matches.", nMatches);
	MessageBox(s->hWnd, lpTxt, "Search finished!", MB_ICONINFORMATION);
	return 0;
}