powerpc/pci: Fix get_phb_number() locking

{
  "id": "c7899aac58095fbfed80102f74a080915e90a01828a40cb1d63810616e9fc887",
  "url": "https://osv.dev/vulnerability/CVE-2022-50045",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "powerpc/pci: Fix get_phb_number() locking",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: powerpc/pci: Fix get_phb_number() locking The recent change to get_phb_number() causes a DEBUG_ATOMIC_SLEEP warning on some systems: BUG: sleeping function called from invalid context at kernel/locking/mutex.c:580 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper preempt_count: 1, expected: 0 RCU nest depth: 0, expected: 0 1 lock held by swapper/1: #0: c157efb0 (hose_spinlock){+.+.}-{2:2}, at: pcibios_alloc_controller+0x64/0x220 Preemption disabled at: [<00000000>] 0x0 CPU: 0 PID: 1 Comm: swapper Not tainted 5.19.0-yocto-standard+ #1 Call Trace: [d101dc90] [c073b264] dump_stack_lvl+0x50/0x8c (unreliable) [d101dcb0] [c0093b70] __might_resched+0x258/0x2a8 [d101dcd0] [c0d3e634] __mutex_lock+0x6c/0x6ec [d101dd50] [c0a84174] of_alias_get_id+0x50/0xf4 [d101dd80] [c002ec78] pcibios_alloc_controller+0x1b8/0x220 [d101ddd0] [c140c9dc] pmac_pci_init+0x198/0x784 [d101de50] [c140852c] discover_phbs+0x30/0x4c [d101de60] [c0007fd4] do_one_initcall+0x94/0x344 [d101ded0] [c1403b40] kernel_init_freeable+0x1a8/0x22c [d101df10] [c00086e0] kernel_init+0x34/0x160 [d101df30] [c001b334] ret_from_kernel_thread+0x5c/0x64 This is because pcibios_alloc_controller() holds hose_spinlock but of_alias_get_id() takes of_mutex which can sleep. The hose_spinlock protects the phb_bitmap, and also the hose_list, but it doesn't need to be held while get_phb_number() calls the OF routines, because those are only looking up in",
    "evidence": "osv:CVE-2022-50045",
    "products": [
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        "name": {
          "value": "Kernel",
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        },
        "prerequisites": [],
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    "severity": "unknown",
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      "modified": "2026-10-28T02:30:51.541417171Z",
      "provider": "osv",
      "references": [
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        "https://git.kernel.org/stable/c/5db5ce0f1963c6c8275719a80cb65e9c98d32726",
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        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50045.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-50045",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 520100,
  "published_at": "2025-06-18T11:01:46.233+00:00"
}