ghsa-j8cp-h624-v86v
Vulnerability from github
Published
2024-05-21 15:31
Modified
2024-05-21 15:31
Details
In the Linux kernel, the following vulnerability has been resolved:
phy: mdio: fix memory leak
Syzbot reported memory leak in MDIO bus interface, the problem was in wrong state logic.
MDIOBUS_ALLOCATED indicates 2 states: 1. Bus is only allocated 2. Bus allocated and __mdiobus_register() fails, but device_register() was called
In case of device_register() has been called we should call put_device() to correctly free the memory allocated for this device, but mdiobus_free() calls just kfree(dev) in case of MDIOBUS_ALLOCATED state
To avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED before calling device_register(), because put_device() should be called even in case of device_register() failure.
{
"affected": [],
"aliases": [
"CVE-2021-47416"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-21T15:15:27Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nphy: mdio: fix memory leak\n\nSyzbot reported memory leak in MDIO bus interface, the problem was in\nwrong state logic.\n\nMDIOBUS_ALLOCATED indicates 2 states:\n\t1. Bus is only allocated\n\t2. Bus allocated and __mdiobus_register() fails, but\n\t device_register() was called\n\nIn case of device_register() has been called we should call put_device()\nto correctly free the memory allocated for this device, but mdiobus_free()\ncalls just kfree(dev) in case of MDIOBUS_ALLOCATED state\n\nTo avoid this behaviour we need to set bus-\u003estate to MDIOBUS_UNREGISTERED\n_before_ calling device_register(), because put_device() should be\ncalled even in case of device_register() failure.",
"id": "GHSA-j8cp-h624-v86v",
"modified": "2024-05-21T15:31:45Z",
"published": "2024-05-21T15:31:45Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47416"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6"
}
],
"schema_version": "1.4.0",
"severity": []
}
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