Tnef: heap out-of-bounds read in get_rtf_data_from_buf() via uncompressed rtf mapi value

{
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver",
                            "lessThanOrEqual": "1.4.18"
                        }
                    ],
                    "packageName": "tnef",
                    "collectionURL": "https://github.com/verdammelt/tnef",
                    "defaultStatus": "unaffected"
                }