{
  "finding_id": "DF-4150",
  "status": "untested",
  "attempts": 0,
  "reproduced": 0,
  "confidence": "likely",
  "impact": "NULL deref of adev->pdev->bus->self in cik_pcie_gen3_enable/cik_program_aspm on root-bus CIK GPUs (upstream pci_is_root_bus guard #if 0d out in the DFly port). Boot/attach DoS on server platforms / VM GPU passthrough topologies.",
  "verdict": "source-verified; hardware-gated (no CIK asic on audit guest)",
  "exploit_chain": [],
  "evidence": "cik.c:1379 root = pdev->bus->self used at :1417/:1630; the #if 0 guard sites 1385-1388/1549-1552 have no replacement",
  "kernel_refs": [
    "sys/dev/drm/amd/amdgpu/cik.c:1379",
    "sys/dev/drm/amd/amdgpu/cik.c:1417",
    "sys/dev/drm/amd/amdgpu/cik.c:1630"
  ],
  "guest_uname": "",
  "code_hash": "",
  "artifact_dir": "findings/poc/DF-4150/",
  "fix_status": "not_testable",
  "fix_baseline_reproduced": 0,
  "fix_patched_reproduced": 0,
  "fix_verdict": "replace the disabled pci_is_root_bus guards with explicit if (adev->pdev->bus->self == NULL) return; in both functions",
  "fix_evidence": "source-only"
}