ghsa-pjwq-hg2p-9vw7
Vulnerability from github
Published
2024-04-03 18:30
Modified
2024-04-03 18:30
Details

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

drm/amd/display: Fix potential null pointer dereference in dc_dmub_srv

Fixes potential null pointer dereference warnings in the dc_dmub_srv_cmd_list_queue_execute() and dc_dmub_srv_is_hw_pwr_up() functions.

In both functions, the 'dc_dmub_srv' variable was being dereferenced before it was checked for null. This could lead to a null pointer dereference if 'dc_dmub_srv' is null. The fix is to check if 'dc_dmub_srv' is null before dereferencing it.

Thus moving the null checks for 'dc_dmub_srv' to the beginning of the functions to ensure that 'dc_dmub_srv' is not null when it is dereferenced.

Found by smatch & thus fixing the below: drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:133 dc_dmub_srv_cmd_list_queue_execute() warn: variable dereferenced before check 'dc_dmub_srv' (see line 128) drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:1167 dc_dmub_srv_is_hw_pwr_up() warn: variable dereferenced before check 'dc_dmub_srv' (see line 1164)

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{
  "affected": [],
  "aliases": [
    "CVE-2024-26729"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-03T17:15:50Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Fix potential null pointer dereference in dc_dmub_srv\n\nFixes potential null pointer dereference warnings in the\ndc_dmub_srv_cmd_list_queue_execute() and dc_dmub_srv_is_hw_pwr_up()\nfunctions.\n\nIn both functions, the \u0027dc_dmub_srv\u0027 variable was being dereferenced\nbefore it was checked for null. This could lead to a null pointer\ndereference if \u0027dc_dmub_srv\u0027 is null. The fix is to check if\n\u0027dc_dmub_srv\u0027 is null before dereferencing it.\n\nThus moving the null checks for \u0027dc_dmub_srv\u0027 to the beginning of the\nfunctions to ensure that \u0027dc_dmub_srv\u0027 is not null when it is\ndereferenced.\n\nFound by smatch \u0026 thus fixing the below:\ndrivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:133 dc_dmub_srv_cmd_list_queue_execute() warn: variable dereferenced before check \u0027dc_dmub_srv\u0027 (see line 128)\ndrivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:1167 dc_dmub_srv_is_hw_pwr_up() warn: variable dereferenced before check \u0027dc_dmub_srv\u0027 (see line 1164)",
  "id": "GHSA-pjwq-hg2p-9vw7",
  "modified": "2024-04-03T18:30:41Z",
  "published": "2024-04-03T18:30:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26729"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/351080ba3414c96afff0f1338b4aeb2983195b80"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2b48f340d9e4a8fbeb1cdc84cd8da6ad143a907"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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