drm/amd/display: Fix out-of-bounds access in 'dcn21_link_encoder_create'

{
  "id": "0379f8f236f9c152447d52c9f0f4e11b962af5f6b796a7168396c53a2a07502e",
  "url": "https://osv.dev/vulnerability/CVE-2024-56608",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/amd/display: Fix out-of-bounds access in 'dcn21_link_encoder_create'",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix out-of-bounds access in 'dcn21_link_encoder_create' An issue was identified in the dcn21_link_encoder_create function where an out-of-bounds access could occur when the hpd_source index was used to reference the link_enc_hpd_regs array. This array has a fixed size and the index was not being checked against the array's bounds before accessing it. This fix adds a conditional check to ensure that the hpd_source index is within the valid range of the link_enc_hpd_regs array. If the index is out of bounds, the function now returns NULL to prevent undefined behavior. References: [ 65.920507] ------------[ cut here ]------------ [ 65.920510] UBSAN: array-index-out-of-bounds in drivers/gpu/drm/amd/amdgpu/../display/dc/resource/dcn21/dcn21_resource.c:1312:29 [ 65.920519] index 7 is out of range for type 'dcn10_link_enc_hpd_registers [5]' [ 65.920523] CPU: 3 PID: 1178 Comm: modprobe Tainted: G OE 6.8.0-cleanershaderfeatureresetasdntipmi200nv2132 #13 [ 65.920525] Hardware name: AMD Majolica-RN/Majolica-RN, BIOS WMJ0429N_Weekly_20_04_2 04/29/2020 [ 65.920527] Call Trace: [ 65.920529] [ 65.920532] dump_stack_lvl+0x48/0x70 [ 65.920541] dump_stack+0x10/0x20 [ 65.920543] __ubsan_handle_out_of_bounds+0xa2/0xe0 [ 65.920549] dcn21_link_encoder_create+0xd9/0x140 [amdgpu] [ 65.921009] link_create+0x6d3/0xed0 [amdgpu] [ 65.921355] create_links+0x18a/0x4e0 [amdgpu] [ 65.921679] dc_create+0x360/0x720 [amdgpu] [",
    "evidence": "osv:CVE-2024-56608",
    "products": [
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          "value": "Kernel",
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        "prerequisites": [],
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    "severity": "high",
    "structured": {
      "id": "CVE-2024-56608",
      "aliases": [
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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      "modified": "2026-10-28T02:30:50.191484920Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/08ac5fdb9c6dc34d0ed4bc64ce3c5c3d411b3b53",
        "https://git.kernel.org/stable/c/280f722601c8bf4d8a9c62dd727cf3a2fd0a47be",
        "https://git.kernel.org/stable/c/5bd410c21037107b83ffbb51dd2d6460f9de9ed1",
        "https://git.kernel.org/stable/c/63de35a8fcfca59ae8750d469a7eb220c7557baf",
        "https://git.kernel.org/stable/c/b19ca8425a4b86e8f0d7c33c4e87ef7b0ebdaa29",
        "https://git.kernel.org/stable/c/f01ddd589e162979421e6914b1c74018633f01e0",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
        "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56608.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-56608",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56608.json"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 518682,
  "published_at": "2024-12-27T14:51:13.21+00:00"
}