net: phy: fix null-ptr-deref while probe() failed

{
  "id": "de5cfeb7dd16b1edf3d13c2b1e553df2e09f9b31540cbed4874df39abac68956",
  "url": "https://osv.dev/vulnerability/CVE-2022-49021",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: phy: fix null-ptr-deref while probe() failed",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: phy: fix null-ptr-deref while probe() failed I got a null-ptr-deref report as following when doing fault injection test: BUG: kernel NULL pointer dereference, address: 0000000000000058 Oops: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 1 PID: 253 Comm: 507-spi-dm9051 Tainted: G B N 6.1.0-rc3+ Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:klist_put+0x2d/0xd0 Call Trace: klist_remove+0xf1/0x1c0 device_release_driver_internal+0x23e/0x2d0 bus_remove_device+0x1bd/0x240 device_del+0x357/0x770 phy_device_remove+0x11/0x30 mdiobus_unregister+0xa5/0x140 release_nodes+0x6a/0xa0 devres_release_all+0xf8/0x150 device_unbind_cleanup+0x19/0xd0 //probe path: phy_device_register() device_add() phy_connect phy_attach_direct() //set device driver probe() //it's failed, driver is not bound device_bind_driver() // probe failed, it's not called //remove path: phy_device_remove() device_del() device_release_driver_internal() __device_release_driver() //dev->drv is not NULL klist_remove() <- knode_driver is not added yet, cause null-ptr-deref In phy_attach_direct(), after setting the 'dev->driver', probe() fails, device_bind_driver() is not called, so the knode_driver->n_klist is not set, then it causes null-ptr-deref in __device_release_driver() while deleting device. Fix this by setting dev->driver to NULL in the error path in phy_attach_direct().",
    "evidence": "osv:CVE-2022-49021",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-49021",
      "aliases": [
        "CVE-2022-49021"
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      "affected": [
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                  "fixed": "0744c7be4de564db03e24527b2e096b7e0e20972"
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:21.456619305Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0744c7be4de564db03e24527b2e096b7e0e20972",
        "https://git.kernel.org/stable/c/369eb2c9f1f72adbe91e0ea8efb130f0a2ba11a6",
        "https://git.kernel.org/stable/c/3e21f85d87c836462bb52ef2078ea561260935c1",
        "https://git.kernel.org/stable/c/51d7f6b20fae8bae64ad1136f1e30d1fd5ba78f7",
        "https://git.kernel.org/stable/c/7730904f50c7187dd16c76949efb56b5fb55cd57",
        "https://git.kernel.org/stable/c/8aaafe0f71314f46a066382a047ba8bb3840d273",
        "https://git.kernel.org/stable/c/eaa5722549ac2604ffa56c2e946acc83226f130c",
        "https://git.kernel.org/stable/c/fe6bc99c27c21348f548966118867ed26a9a372c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49021.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49021",
        "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-2022-49021.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49021",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 487471,
  "published_at": "2024-10-21T20:06:28.608+00:00"
}