ghsa-pw84-w4v5-39jj
Vulnerability from github
Published
2024-07-29 15:30
Modified
2024-07-29 15:30
Details

In the Linux kernel, the following vulnerability has been resolved:

btrfs: qgroup: fix quota root leak after quota disable failure

If during the quota disable we fail when cleaning the quota tree or when deleting the root from the root tree, we jump to the 'out' label without ever dropping the reference on the quota root, resulting in a leak of the root since fs_info->quota_root is no longer pointing to the root (we have set it to NULL just before those steps).

Fix this by always doing a btrfs_put_root() call under the 'out' label. This is a problem that exists since qgroups were first added in 2012 by commit bed92eae26cc ("Btrfs: qgroup implementation and prototypes"), but back then we missed a kfree on the quota root and free_extent_buffer() calls on its root and commit root nodes, since back then roots were not yet reference counted.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-41078"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-29T15:15:15Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: qgroup: fix quota root leak after quota disable failure\n\nIf during the quota disable we fail when cleaning the quota tree or when\ndeleting the root from the root tree, we jump to the \u0027out\u0027 label without\never dropping the reference on the quota root, resulting in a leak of the\nroot since fs_info-\u003equota_root is no longer pointing to the root (we have\nset it to NULL just before those steps).\n\nFix this by always doing a btrfs_put_root() call under the \u0027out\u0027 label.\nThis is a problem that exists since qgroups were first added in 2012 by\ncommit bed92eae26cc (\"Btrfs: qgroup implementation and prototypes\"), but\nback then we missed a kfree on the quota root and free_extent_buffer()\ncalls on its root and commit root nodes, since back then roots were not\nyet reference counted.",
  "id": "GHSA-pw84-w4v5-39jj",
  "modified": "2024-07-29T15:30:47Z",
  "published": "2024-07-29T15:30:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-41078"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5ef3961682e5310f2221bae99bcf9f5d0f4b0d51"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7dd6a5b96157a21245566b21fd58276a214357ff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a69529f22590b67bb018de9acbcf94abc8603cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94818bdb00ef34a996a06aa63d11f591074cb757"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7e4c6a3031c74078dba7fa36239d0f4fe476c53"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f88aeff5a173e8ba3133314eb4b964236ef3589d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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