ghsa-7pj6-rq69-3m65
Vulnerability from github
Published
2024-10-21 18:30
Modified
2024-11-08 18:30
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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

ocfs2: fix null-ptr-deref when journal load failed.

During the mounting process, if journal_reset() fails because of too short journal, then lead to jbd2_journal_load() fails with NULL j_sb_buffer. Subsequently, ocfs2_journal_shutdown() calls jbd2_journal_flush()->jbd2_cleanup_journal_tail()-> __jbd2_update_log_tail()->jbd2_journal_update_sb_log_tail() ->lock_buffer(journal->j_sb_buffer), resulting in a null-pointer dereference error.

To resolve this issue, we should check the JBD2_LOADED flag to ensure the journal was properly loaded. Additionally, use journal instead of osb->journal directly to simplify the code.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-49957"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-21T18:15:16Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix null-ptr-deref when journal load failed.\n\nDuring the mounting process, if journal_reset() fails because of too short\njournal, then lead to jbd2_journal_load() fails with NULL j_sb_buffer. \nSubsequently, ocfs2_journal_shutdown() calls\njbd2_journal_flush()-\u003ejbd2_cleanup_journal_tail()-\u003e\n__jbd2_update_log_tail()-\u003ejbd2_journal_update_sb_log_tail()\n-\u003elock_buffer(journal-\u003ej_sb_buffer), resulting in a null-pointer\ndereference error.\n\nTo resolve this issue, we should check the JBD2_LOADED flag to ensure the\njournal was properly loaded.  Additionally, use journal instead of\nosb-\u003ejournal directly to simplify the code.",
  "id": "GHSA-7pj6-rq69-3m65",
  "modified": "2024-11-08T18:30:45Z",
  "published": "2024-10-21T18:30:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-49957"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/387bf565cc03e2e8c720b8b4798efea4aacb6962"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5784d9fcfd43bd853654bb80c87ef293b9e8e80a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/703b2c7e0798d263154dc8593dc2345f75dc077f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82dfdd1e31e774578f76ce6dc90c834f96403a0f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/86a89e75e9e4dfa768b97db466ad6bedf2e7ea5b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bf605ae98dab5c15c5b631d4d7f88898cb41b649"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f60e94a83db799bde625ac8671a5b4a6354e7120"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fd89d92c1140cee8f59de336cb37fa65e359c123"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff55291fb36779819211b596da703389135f5b05"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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