drm: Fix potential null-ptr-deref in drm_vblank_destroy_worker()

{
  "id": "bc80b5b0478d8721cbb78b8faa0331e957512c3de5c107023d1f080c0434c362",
  "url": "https://osv.dev/vulnerability/CVE-2022-49827",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm: Fix potential null-ptr-deref in drm_vblank_destroy_worker()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm: Fix potential null-ptr-deref in drm_vblank_destroy_worker() drm_vblank_init() call drmm_add_action_or_reset() with drm_vblank_init_release() as action. If __drmm_add_action() failed, will directly call drm_vblank_init_release() with the vblank whose worker is NULL. As the resule, a null-ptr-deref will happen in kthread_destroy_worker(). Add the NULL check before calling drm_vblank_destroy_worker(). BUG: null-ptr-deref KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f] CPU: 5 PID: 961 Comm: modprobe Not tainted 6.0.0-11331-gd465bff130bf-dirty RIP: 0010:kthread_destroy_worker+0x25/0xb0 Call Trace: drm_vblank_init_release+0x124/0x220 [drm] ? drm_crtc_vblank_restore+0x8b0/0x8b0 [drm] __drmm_add_action_or_reset+0x41/0x50 [drm] drm_vblank_init+0x282/0x310 [drm] vkms_init+0x35f/0x1000 [vkms] ? 0xffffffffc4508000 ? lock_is_held_type+0xd7/0x130 ? __kmem_cache_alloc_node+0x1c2/0x2b0 ? lock_is_held_type+0xd7/0x130 ? 0xffffffffc4508000 do_one_initcall+0xd0/0x4f0 ... do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0",
    "evidence": "osv:CVE-2022-49827",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.156",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.80",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.0.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-49827",
      "aliases": [
        "CVE-2022-49827"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "1d160dfb3fdf11ba9447e862c548447f91f4e74a"
                },
                {
                  "fixed": "e884a6c2d49a6c12761e5bed851e9fe93bd923a1"
                },
                {
                  "fixed": "3acd2016421b2e628acad65495d15493bf7a3bc3"
                },
                {
                  "fixed": "4979524f5a2a8210e87fde2f642b0dc060860821"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49827.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.9.0"
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                  "fixed": "5.10.156"
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.80"
                }
              ]
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.0.10"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49827.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:39.300005930Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1d160dfb3fdf11ba9447e862c548447f91f4e74a",
        "https://git.kernel.org/stable/c/3acd2016421b2e628acad65495d15493bf7a3bc3",
        "https://git.kernel.org/stable/c/4979524f5a2a8210e87fde2f642b0dc060860821",
        "https://git.kernel.org/stable/c/e884a6c2d49a6c12761e5bed851e9fe93bd923a1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49827.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49827",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49827.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49827",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 506417,
  "published_at": "2025-05-01T14:09:46.805+00:00"
}