CVE-2025-40205 btrfs: avoid potential out-of-bounds in btrfs_encode_fh()

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/btrfs/export.c"
    ],
    "versions": [
      {
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  {
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    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/btrfs/export.c"
    ],
    "versions": [
      {
        "version": "2.6.29",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.29",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.4.301",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.10.246",
        "lessThanOrEqual": "5.10.*",
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      },
      {
        "version": "5.15.195",
        "lessThanOrEqual": "5.15.*",
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      },
      {
        "version": "6.1.157",
        "lessThanOrEqual": "6.1.*",
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      },
      {
        "version": "6.6.113",
        "lessThanOrEqual": "6.6.*",
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      },
      {
        "version": "6.12.54",
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      },
      {
        "version": "6.17.4",
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      {
        "version": "6.18",
        "lessThanOrEqual": "*",
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        "versionType": "original_commit_for_fix"
      }
    ]
  }
]