net: dsa: Fix possible memory leaks in dsa_loop_init()

{
  "id": "b892931cf3b0a7f93690b4889ead0eb88bfa494f5c762274a944b1c15cc12d7d",
  "url": "https://osv.dev/vulnerability/CVE-2022-49926",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: dsa: Fix possible memory leaks in dsa_loop_init()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: dsa: Fix possible memory leaks in dsa_loop_init() kmemleak reported memory leaks in dsa_loop_init(): kmemleak: 12 new suspected memory leaks unreferenced object 0xffff8880138ce000 (size 2048): comm \"modprobe\", pid 390, jiffies 4295040478 (age 238.976s) backtrace: [<000000006a94f1d5>] kmalloc_trace+0x26/0x60 [<00000000a9c44622>] phy_device_create+0x5d/0x970 [<00000000d0ee2afc>] get_phy_device+0xf3/0x2b0 [<00000000dca0c71f>] __fixed_phy_register.part.0+0x92/0x4e0 [<000000008a834798>] fixed_phy_register+0x84/0xb0 [<0000000055223fcb>] dsa_loop_init+0xa9/0x116 [dsa_loop] ... There are two reasons for memleak in dsa_loop_init(). First, fixed_phy_register() create and register phy_device: fixed_phy_register() get_phy_device() phy_device_create() # freed by phy_device_free() phy_device_register() # freed by phy_device_remove() But fixed_phy_unregister() only calls phy_device_remove(). So the memory allocated in phy_device_create() is leaked. Second, when mdio_driver_register() fail in dsa_loop_init(), it just returns and there is no cleanup for phydevs. Fix the problems by catching the error of mdio_driver_register() in dsa_loop_init(), then calling both fixed_phy_unregister() and phy_device_free() to release phydevs. Also add a function for phydevs cleanup to avoid duplacate.",
    "evidence": "osv:CVE-2022-49926",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "4.14.299",
            "evidence": "/affected/1/ranges"
          },
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            "evidence": "/affected/1/ranges"
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    "severity": "medium",
    "structured": {
      "id": "CVE-2022-49926",
      "aliases": [
        "CVE-2022-49926"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49926.json"
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        {
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              "type": "ECOSYSTEM",
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      ],
      "modified": "2026-10-28T02:30:29.734793065Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/37a098fc9b42bd7fce66764866aa514639667b6e",
        "https://git.kernel.org/stable/c/4d2024b138d9f7b02ae13ee997fd3a71e9e46254",
        "https://git.kernel.org/stable/c/633efc8b3dc96f56f5a57f2a49764853a2fa3f50",
        "https://git.kernel.org/stable/c/935b4beb724946a37cebf97191592d4879d3a3a3",
        "https://git.kernel.org/stable/c/9f555b1584fc2d5d16ee3c4d9438e93ac7c502c7",
        "https://git.kernel.org/stable/c/bbc5d7b46a729bfcbb5544f6612b7a67dd4f4d6f",
        "https://git.kernel.org/stable/c/d593e1ede655b74c42e4e4fe285ea64aee96fb5c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49926.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49926",
        "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-2022-49926.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49926",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496500,
  "published_at": "2025-05-01T14:11:04.691+00:00"
}