CVE-2024-49880 ext4: fix off by one issue in alloc_flex_gd()

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/ext4/resize.c"
    ],
    "versions": [
      {
        "version": "665d3e0af4d35acf9a5f58dfd471bc27dbf55880",
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  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/ext4/resize.c"
    ],
    "versions": [
      {
        "version": "6.8",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.8",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.10.14",
        "lessThanOrEqual": "6.10.*",
        "status": "unaffected",
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      },
      {
        "version": "6.11.3",
        "lessThanOrEqual": "6.11.*",
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      {
        "version": "6.12",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]