ghsa-969w-fmcp-j8rq
Vulnerability from github
Published
2024-05-22 09:31
Modified
2024-05-22 09:31
Details

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

drm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read

In commit e11f5bd8228f ("drm: Add support for DP 1.4 Compliance edid corruption test") the function connector_bad_edid() started assuming that the memory for the EDID passed to it was big enough to hold edid[0x7e] + 1 blocks of data (1 extra for the base block). It completely ignored the fact that the function was passed num_blocks which indicated how much memory had been allocated for the EDID.

Let's fix this by adding a bounds check.

This is important for handling the case where there's an error in the first block of the EDID. In that case we will call connector_bad_edid() without having re-allocated memory based on edid[0x7e].

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47444"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-22T07:15:09Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read\n\nIn commit e11f5bd8228f (\"drm: Add support for DP 1.4 Compliance edid\ncorruption test\") the function connector_bad_edid() started assuming\nthat the memory for the EDID passed to it was big enough to hold\n`edid[0x7e] + 1` blocks of data (1 extra for the base block). It\ncompletely ignored the fact that the function was passed `num_blocks`\nwhich indicated how much memory had been allocated for the EDID.\n\nLet\u0027s fix this by adding a bounds check.\n\nThis is important for handling the case where there\u0027s an error in the\nfirst block of the EDID. In that case we will call\nconnector_bad_edid() without having re-allocated memory based on\n`edid[0x7e]`.",
  "id": "GHSA-969w-fmcp-j8rq",
  "modified": "2024-05-22T09:31:45Z",
  "published": "2024-05-22T09:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47444"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/09f3946bb452918dbfb1982add56f9ffaae393dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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