erofs: avoid infinite loops due to corrupted subpage compact indexes

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/erofs/zmap.c"
                    ],
                    "versions": [
                        {
                            "version": "3f691aa676f29586e83e6c032713554a290418c3",
                            "lessThan": "b18a82503a67a530d48f5a5b429e162749fe2c89",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8d2517aaeea3ab8651bb517bca8f3c8664d318ea",
                            "lessThan": "dbfac1b85d0753996ddfef636934d431b588dd1f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8d2517aaeea3ab8651bb517bca8f3c8664d318ea",
                            "lessThan": "8675447a8794983f2b7e694b378112772c17635e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8d2517aaeea3ab8651bb517bca8f3c8664d318ea",
                            "lessThan": "e13d315ae077bb7c3c6027cc292401bc0f4ec683",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "22438a34d383ec2789eaf450728e38abc53051f8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6.6.16",
                            "lessThan": "6.6.160",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.7.4",
                            "lessThan": "6.8",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/erofs/zmap.c"
                    ],
                    "versions": [
                        {
                            "version": "6.8",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.8",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.160",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.91",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.17.6",
                            "lessThanOrEqual": "6.17.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }