if ( !v12
      || (!(LOBYTE(v12->MdlFlags) & 5) ? (src = (int)MmMapLockedPagesSpecifyCache(
                                                       Irp->MdlAddress,
                                                       0,
                                                       MmCached,
                                                       NULL,
                                                       0,
                                                       NormalPagePriority), v5 = 0) : (src = (int)v12->MappedSystemVa), src == v5 || *(_DWORD *)(v3 + 16) != v5 || *(_DWORD *)(v3 + 12) == v5 || (length = *((_DWORD *)v6 + 1), v25 = v2->MdlAddress, v28 = length, length > v25->ByteCount)) )