ghsa-2wcp-6fq9-mcr6
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: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field

If driver read val value sufficient for (val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 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 alignment]

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47386"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:24Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field\n\nIf driver read val value sufficient for\n(val \u0026 0x08) \u0026\u0026 (!(val \u0026 0x80)) \u0026\u0026 ((val \u0026 0x7) == ((val \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 alignment]",
  "id": "GHSA-2wcp-6fq9-mcr6",
  "modified": "2024-05-21T15:31:44Z",
  "published": "2024-05-21T15:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47386"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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