ghsa-5cp3-hg96-hvr9
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: mdiobus: fix unbalanced node reference count

I got the following report while doing device(mscc-miim) load test with CONFIG_OF_UNITTEST and CONFIG_OF_DYNAMIC enabled:

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@7107009c/ethernet-phy@0

If the 'fwnode' is not an acpi node, the refcount is get in fwnode_mdiobus_phy_device_register(), but it has never been put when the device is freed in the normal path. So call fwnode_handle_put() in phy_device_release() to avoid leak.

If it's an acpi node, it has never been get, but it's put in the error path, so call fwnode_handle_get() before phy_device_register() to keep get/put operation balanced.

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{
   affected: [],
   aliases: [
      "CVE-2022-49016",
   ],
   database_specific: {
      cwe_ids: [
         "CWE-401",
      ],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2024-10-21T20:15:12Z",
      severity: "MODERATE",
   },
   details: "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mdiobus: fix unbalanced node reference count\n\nI got the following report while doing device(mscc-miim) load test\nwith CONFIG_OF_UNITTEST and CONFIG_OF_DYNAMIC enabled:\n\n  OF: ERROR: memory leak, expected refcount 1 instead of 2,\n  of_node_get()/of_node_put() unbalanced - destroy cset entry:\n  attach overlay node /spi/soc@0/mdio@7107009c/ethernet-phy@0\n\nIf the 'fwnode' is not an acpi node, the refcount is get in\nfwnode_mdiobus_phy_device_register(), but it has never been\nput when the device is freed in the normal path. So call\nfwnode_handle_put() in phy_device_release() to avoid leak.\n\nIf it's an acpi node, it has never been get, but it's put\nin the error path, so call fwnode_handle_get() before\nphy_device_register() to keep get/put operation balanced.",
   id: "GHSA-5cp3-hg96-hvr9",
   modified: "2024-10-24T21:31:02Z",
   published: "2024-10-21T21:30:52Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2022-49016",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/2708b357440427d6a9fee667eb7b8307f4625adc",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/543d917f691ab06885ee779c862065899eaa4251",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/cdde1560118f82498fc9e9a7c1ef7f0ef7755891",
      },
   ],
   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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