ghsa-h6gr-4677-26p9
Vulnerability from github
Published
2024-05-21 15:31
Modified
2024-05-21 15:31
Details

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

hwmon: (w83793) Fix NULL pointer dereference by removing unnecessary structure field

If driver read tmp value sufficient for (tmp & 0x08) && (!(tmp & 0x80)) && ((tmp & 0x7) == ((tmp >> 4) & 0x7)) from device then Null pointer dereference occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not serve a purpose anymore after switching to devm_i2c_new_dummy_device() in w83791d_detect_subclients().

The patch fixes possible NULL pointer dereference by removing lm75[].

Found by Linux Driver Verification project (linuxtesting.org).

[groeck: Dropped unnecessary continuation lines, fixed multi-line alignments]

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47384"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:23Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (w83793) Fix NULL pointer dereference by removing unnecessary structure field\n\nIf driver read tmp value sufficient for\n(tmp \u0026 0x08) \u0026\u0026 (!(tmp \u0026 0x80)) \u0026\u0026 ((tmp \u0026 0x7) == ((tmp \u003e\u003e 4) \u0026 0x7))\nfrom device then Null pointer dereference occurs.\n(It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers)\nAlso lm75[] does not serve a purpose anymore after switching to\ndevm_i2c_new_dummy_device() in w83791d_detect_subclients().\n\nThe patch fixes possible NULL pointer dereference by removing lm75[].\n\nFound by Linux Driver Verification project (linuxtesting.org).\n\n[groeck: Dropped unnecessary continuation lines, fixed multi-line alignments]",
  "id": "GHSA-h6gr-4677-26p9",
  "modified": "2024-05-21T15:31:44Z",
  "published": "2024-05-21T15:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47384"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6cb01fe630eaffc5a2c3f7364436caddba286623"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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