ghsa-mhhw-j772-75h5
Vulnerability from github
Published
2024-08-17 09:30
Modified
2024-08-19 21:35
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:

net: mediatek: Fix potential NULL pointer dereference in dummy net_device handling

Move the freeing of the dummy net_device from mtk_free_dev() to mtk_remove().

Previously, if alloc_netdev_dummy() failed in mtk_probe(), eth->dummy_dev would be NULL. The error path would then call mtk_free_dev(), which in turn called free_netdev() assuming dummy_dev was allocated (but it was not), potentially causing a NULL pointer dereference.

By moving free_netdev() to mtk_remove(), we ensure it's only called when mtk_probe() has succeeded and dummy_dev is fully allocated. This addresses a potential NULL pointer dereference detected by Smatch[1].

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2024-42282"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-08-17T09:15:09Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mediatek: Fix potential NULL pointer dereference in dummy net_device handling\n\nMove the freeing of the dummy net_device from mtk_free_dev() to\nmtk_remove().\n\nPreviously, if alloc_netdev_dummy() failed in mtk_probe(),\neth-\u003edummy_dev would be NULL. The error path would then call\nmtk_free_dev(), which in turn called free_netdev() assuming dummy_dev\nwas allocated (but it was not), potentially causing a NULL pointer\ndereference.\n\nBy moving free_netdev() to mtk_remove(), we ensure it\u0027s only called when\nmtk_probe() has succeeded and dummy_dev is fully allocated. This\naddresses a potential NULL pointer dereference detected by Smatch[1].",
  "id": "GHSA-mhhw-j772-75h5",
  "modified": "2024-08-19T21:35:09Z",
  "published": "2024-08-17T09:30:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-42282"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16f3a28cf5f876a7f3550d8f4c870a7b41bcfaef"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/af6bd5c9901b13a26eaf4d57d97a813297791596"
    }
  ],
  "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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