ghsa-6wpg-r63h-r729
Vulnerability from github
Published
2024-10-21 21:30
Modified
2024-10-24 21:31
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: mdio: fix unbalanced fwnode reference count in mdio_device_release()

There is warning report about of_node refcount leak while probing mdio device:

OF: ERROR: memory leak, expected refcount 1 instead of 2, of_node_get()/of_node_put() unbalanced - destroy cset entry: attach overlay node /spi/soc@0/mdio@710700c0/ethernet@4

In of_mdiobus_register_device(), we increase fwnode refcount by fwnode_handle_get() before associating the of_node with mdio device, but it has never been decreased in normal path. Since that, in mdio_device_release(), it needs to call fwnode_handle_put() in addition instead of calling kfree() directly.

After above, just calling mdio_device_free() in the error handle path of of_mdiobus_register_device() is enough to keep the refcount balanced.

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{
  "affected": [],
  "aliases": [
    "CVE-2022-48961"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-21T20:15:07Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mdio: fix unbalanced fwnode reference count in mdio_device_release()\n\nThere is warning report about of_node refcount leak\nwhile probing mdio device:\n\nOF: ERROR: memory leak, expected refcount 1 instead of 2,\nof_node_get()/of_node_put() unbalanced - destroy cset entry:\nattach overlay node /spi/soc@0/mdio@710700c0/ethernet@4\n\nIn of_mdiobus_register_device(), we increase fwnode refcount\nby fwnode_handle_get() before associating the of_node with\nmdio device, but it has never been decreased in normal path.\nSince that, in mdio_device_release(), it needs to call\nfwnode_handle_put() in addition instead of calling kfree()\ndirectly.\n\nAfter above, just calling mdio_device_free() in the error handle\npath of of_mdiobus_register_device() is enough to keep the\nrefcount balanced.",
  "id": "GHSA-6wpg-r63h-r729",
  "modified": "2024-10-24T21:31:02Z",
  "published": "2024-10-21T21:30:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48961"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16854177745a5648f8ec322353b432e18460f43a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a5c6de1a6656b8cc6bce7cb3d9874dd7df4968c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb37617687f2bfa5b675df7779f869147c9002bd"
    }
  ],
  "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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