CVE-2026-64431 ntfs: avoid calling post_write_mst_fixup() for invalid index_block

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/ntfs/index.c"
    ],
    "versions": [
      {
        "version": "0a8ac0c1fa0b99a5b29002bc7f232ed7eafddef0",
        "lessThan": "e2018628301a6d9f54e34b0cb417f1688c66df1d",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "0a8ac0c1fa0b99a5b29002bc7f232ed7eafddef0",
        "lessThan": "5b6eedd7cc2936f9238e852b553a1b326105bde8",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/ntfs/index.c"
    ],
    "versions": [
      {
        "version": "7.1",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "7.1",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.1.4",
        "lessThanOrEqual": "7.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.2-rc3",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]