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{
"id": "CVE-2022-48813",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2024-07-16T12:15:05.493",
"lastModified": "2024-11-21T07:34:08.230",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: felix: don't use devres for mdiobus\n\nAs explained in commits:\n74b6d7d13307 (\"net: dsa: realtek: register the MDIO bus under devres\")\n5135e96a3dd2 (\"net: dsa: don't allocate the slave_mii_bus using devres\")\n\nmdiobus_free() will panic when called from devm_mdiobus_free() <-\ndevres_release_all() <- __device_release_driver(), and that mdiobus was\nnot previously unregistered.\n\nThe Felix VSC9959 switch is a PCI device, so the initial set of\nconstraints that I thought would cause this (I2C or SPI buses which call\n->remove on ->shutdown) do not apply. But there is one more which\napplies here.\n\nIf the DSA master itself is on a bus that calls ->remove from ->shutdown\n(like dpaa2-eth, which is on the fsl-mc bus), there is a device link\nbetween the switch and the DSA master, and device_links_unbind_consumers()\nwill unbind the felix switch driver on shutdown.\n\nSo the same treatment must be applied to all DSA switch drivers, which\nis: either use devres for both the mdiobus allocation and registration,\nor don't use devres at all.\n\nThe felix driver has the code structure in place for orderly mdiobus\nremoval, so just replace devm_mdiobus_alloc_size() with the non-devres\nvariant, and add manual free where necessary, to ensure that we don't\nlet devres free a still-registered bus."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: dsa: felix: don't use devres for mdiobus Como se explica en los commits: 74b6d7d13307 (\"net: dsa: realtek: registre el bus MDIO en devres\") 5135e96a3dd2 (\" net: dsa: no asigne el esclavo_mii_bus usando devres\") mdiobus_free() entrar\u00e1 en p\u00e1nico cuando se llame desde devm_mdiobus_free() &lt;- devres_release_all() &lt;- __device_release_driver(), y ese mdiobus no fue anulado previamente. El conmutador Felix VSC9959 es un dispositivo PCI, por lo que el conjunto inicial de restricciones que pens\u00e9 que causar\u00edan esto (buses I2C o SPI que llaman -&gt;eliminar activado -&gt;apagar) no se aplican. Pero hay algo m\u00e1s que se aplica aqu\u00ed. Si el maestro DSA est\u00e1 en un bus que llama -&gt;remove from -&gt;shutdown (como dpaa2-eth, que est\u00e1 en el bus fsl-mc), hay un enlace de dispositivo entre el conmutador y el maestro DSA, y device_links_unbind_consumers( ) desvincular\u00e1 el controlador del interruptor Felix al apagarlo. Por lo tanto, se debe aplicar el mismo tratamiento a todos los controladores de conmutador DSA, que es: usar devres tanto para la asignaci\u00f3n como para el registro de mdiobus, o no usar devres en absoluto. El controlador Felix tiene la estructura de c\u00f3digo implementada para la eliminaci\u00f3n ordenada de mdiobus, as\u00ed que simplemente reemplace devm_mdiobus_alloc_size() con la variante que no es devres y agregue manual free cuando sea necesario, para garantizar que no permitamos que devres libere un bus a\u00fan registrado."
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/209bdb7ec6a28c7cdf580a0a98afbc9fc3b98932",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8cda7577a0b4018572f31e0caadfabd305ea2786",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/95e5402f9430b3c7d885dd3ec4c8c02c17936923",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9db6f056efd089e80d81c774c01b639adf30c097",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/209bdb7ec6a28c7cdf580a0a98afbc9fc3b98932",
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://git.kernel.org/stable/c/8cda7577a0b4018572f31e0caadfabd305ea2786",
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://git.kernel.org/stable/c/95e5402f9430b3c7d885dd3ec4c8c02c17936923",
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://git.kernel.org/stable/c/9db6f056efd089e80d81c774c01b639adf30c097",
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
]
}