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()->jbd2_cleanup_journal_tail()->\n__jbd2_update_log_tail()->jbd2_journal_update_sb_log_tail()\n->lock_buffer(journal->j_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->journal 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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