CVE-2022-50545 (GCVE-0-2022-50545)
Vulnerability from cvelistv5
Published
2025-10-07 15:21
Modified
2025-10-07 15:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: r6040: Fix kmemleak in probe and remove There is a memory leaks reported by kmemleak: unreferenced object 0xffff888116111000 (size 2048): comm "modprobe", pid 817, jiffies 4294759745 (age 76.502s) hex dump (first 32 bytes): 00 c4 0a 04 81 88 ff ff 08 10 11 16 81 88 ff ff ................ 08 10 11 16 81 88 ff ff 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff815bcd82>] kmalloc_trace+0x22/0x60 [<ffffffff827e20ee>] phy_device_create+0x4e/0x90 [<ffffffff827e6072>] get_phy_device+0xd2/0x220 [<ffffffff827e7844>] mdiobus_scan+0xa4/0x2e0 [<ffffffff827e8be2>] __mdiobus_register+0x482/0x8b0 [<ffffffffa01f5d24>] r6040_init_one+0x714/0xd2c [r6040] ... The problem occurs in probe process as follows: r6040_init_one: mdiobus_register mdiobus_scan <- alloc and register phy_device, the reference count of phy_device is 3 r6040_mii_probe phy_connect <- connect to the first phy_device, so the reference count of the first phy_device is 4, others are 3 register_netdev <- fault inject succeeded, goto error handling path // error handling path err_out_mdio_unregister: mdiobus_unregister(lp->mii_bus); err_out_mdio: mdiobus_free(lp->mii_bus); <- the reference count of the first phy_device is 1, it is not released and other phy_devices are released // similarly, the remove process also has the same problem The root cause is traced to the phy_device is not disconnected when removes one r6040 device in r6040_remove_one() or on error handling path after r6040_mii probed successfully. In r6040_mii_probe(), a net ethernet device is connected to the first PHY device of mii_bus, in order to notify the connected driver when the link status changes, which is the default behavior of the PHY infrastructure to handle everything. Therefore the phy_device should be disconnected when removes one r6040 device or on error handling path. Fix it by adding phy_disconnect() when removes one r6040 device or on error handling path after r6040_mii probed successfully.
References
Impacted products
Vendor Product Version
Linux Linux Version: 3831861b4ad8fd0ad7110048eb3e155628799d2b
Version: 3831861b4ad8fd0ad7110048eb3e155628799d2b
Version: 3831861b4ad8fd0ad7110048eb3e155628799d2b
Version: 3831861b4ad8fd0ad7110048eb3e155628799d2b
Version: 3831861b4ad8fd0ad7110048eb3e155628799d2b
Version: 3831861b4ad8fd0ad7110048eb3e155628799d2b
Version: 3831861b4ad8fd0ad7110048eb3e155628799d2b
Version: 3831861b4ad8fd0ad7110048eb3e155628799d2b
Version: 3831861b4ad8fd0ad7110048eb3e155628799d2b
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{
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nr6040: Fix kmemleak in probe and remove\n\nThere is a memory leaks reported by kmemleak:\n\n  unreferenced object 0xffff888116111000 (size 2048):\n    comm \"modprobe\", pid 817, jiffies 4294759745 (age 76.502s)\n    hex dump (first 32 bytes):\n      00 c4 0a 04 81 88 ff ff 08 10 11 16 81 88 ff ff  ................\n      08 10 11 16 81 88 ff ff 00 00 00 00 00 00 00 00  ................\n    backtrace:\n      [\u003cffffffff815bcd82\u003e] kmalloc_trace+0x22/0x60\n      [\u003cffffffff827e20ee\u003e] phy_device_create+0x4e/0x90\n      [\u003cffffffff827e6072\u003e] get_phy_device+0xd2/0x220\n      [\u003cffffffff827e7844\u003e] mdiobus_scan+0xa4/0x2e0\n      [\u003cffffffff827e8be2\u003e] __mdiobus_register+0x482/0x8b0\n      [\u003cffffffffa01f5d24\u003e] r6040_init_one+0x714/0xd2c [r6040]\n      ...\n\nThe problem occurs in probe process as follows:\n  r6040_init_one:\n    mdiobus_register\n      mdiobus_scan    \u003c- alloc and register phy_device,\n                         the reference count of phy_device is 3\n    r6040_mii_probe\n      phy_connect     \u003c- connect to the first phy_device,\n                         so the reference count of the first\n                         phy_device is 4, others are 3\n    register_netdev   \u003c- fault inject succeeded, goto error handling path\n\n    // error handling path\n    err_out_mdio_unregister:\n      mdiobus_unregister(lp-\u003emii_bus);\n    err_out_mdio:\n      mdiobus_free(lp-\u003emii_bus);    \u003c- the reference count of the first\n                                       phy_device is 1, it is not released\n                                       and other phy_devices are released\n  // similarly, the remove process also has the same problem\n\nThe root cause is traced to the phy_device is not disconnected when\nremoves one r6040 device in r6040_remove_one() or on error handling path\nafter r6040_mii probed successfully. In r6040_mii_probe(), a net ethernet\ndevice is connected to the first PHY device of mii_bus, in order to\nnotify the connected driver when the link status changes, which is the\ndefault behavior of the PHY infrastructure to handle everything.\nTherefore the phy_device should be disconnected when removes one r6040\ndevice or on error handling path.\n\nFix it by adding phy_disconnect() when removes one r6040 device or on\nerror handling path after r6040_mii probed successfully."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-07T15:21:09.288Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a04707f4596952049da05756c27398c34d9a1d36"
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          "url": "https://git.kernel.org/stable/c/b4448816e6a565e08236a6009c6bf48c6836cdfd"
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        {
          "url": "https://git.kernel.org/stable/c/7e43039a49c2da45edc1d9d7c9ede4003ab45a5f"
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      ],
      "title": "r6040: Fix kmemleak in probe and remove",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50545",
    "datePublished": "2025-10-07T15:21:09.288Z",
    "dateReserved": "2025-10-07T15:15:38.667Z",
    "dateUpdated": "2025-10-07T15:21:09.288Z",
    "state": "PUBLISHED"
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  }
}


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