drm/amdgpu: Fix a null pointer access when the smc_rreg pointer is NULL

{
  "id": "8cd5a5c324c6209d9141d8c05bba3f7b03091815be4e33b5bf1b8dd9461e44f6",
  "url": "https://osv.dev/vulnerability/CVE-2023-52817",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/amdgpu: Fix a null pointer access when the smc_rreg pointer is NULL",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Fix a null pointer access when the smc_rreg pointer is NULL In certain types of chips, such as VEGA20, reading the amdgpu_regs_smc file could result in an abnormal null pointer access when the smc_rreg pointer is NULL. Below are the steps to reproduce this issue and the corresponding exception log: 1. Navigate to the directory: /sys/kernel/debug/dri/0 2. Execute command: cat amdgpu_regs_smc 3. Exception Log:: [4005007.702554] BUG: kernel NULL pointer dereference, address: 0000000000000000 [4005007.702562] #PF: supervisor instruction fetch in kernel mode [4005007.702567] #PF: error_code(0x0010) - not-present page [4005007.702570] PGD 0 P4D 0 [4005007.702576] Oops: 0010 [#1] SMP NOPTI [4005007.702581] CPU: 4 PID: 62563 Comm: cat Tainted: G OE 5.15.0-43-generic #46-Ubunt u [4005007.702590] RIP: 0010:0x0 [4005007.702598] Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. [4005007.702600] RSP: 0018:ffffa82b46d27da0 EFLAGS: 00010206 [4005007.702605] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffa82b46d27e68 [4005007.702609] RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff9940656e0000 [4005007.702612] RBP: ffffa82b46d27dd8 R08: 0000000000000000 R09: ffff994060c07980 [4005007.702615] R10: 0000000000020000 R11: 0000000000000000 R12: 00007f5e06753000 [4005007.702618] R13: ffff9940656e0000 R14: ffffa82b46d27e68 R15: 00007f5e06753000 [4005007.702622] FS: 00007f5e0755b740(0000) GS:ffff9",
    "evidence": "osv:CVE-2023-52817",
    "products": [
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        "prerequisites": [],
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    "severity": "medium",
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
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      "modified": "2026-10-28T02:30:34.174033516Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/174f62a0aa15c211e60208b41ee9e7cdfb73d455",
        "https://git.kernel.org/stable/c/437e0fa907ba39b4d7eda863c03ea9cf48bd93a9",
        "https://git.kernel.org/stable/c/5104fdf50d326db2c1a994f8b35dcd46e63ae4ad",
        "https://git.kernel.org/stable/c/6c1b3d89a2dda79881726bb6e37af19c0936d736",
        "https://git.kernel.org/stable/c/820daf9ffe2b0afb804567b10983fb38bc5ae288",
        "https://git.kernel.org/stable/c/ba3c0796d292de84f2932cc5bbb0f771fc720996",
        "https://git.kernel.org/stable/c/bf2d51eedf03bd61e3556e35d74d49e2e6112398",
        "https://git.kernel.org/stable/c/f475d5502f33a6c5b149b0afe96316ad1962a64a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52817.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-52817",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
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        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52817.json"
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 501251,
  "published_at": "2024-05-21T15:31:24.225+00:00"
}