fkie_cve-2022-48814
Vulnerability from fkie_nvd
Published
2024-07-16 12:15
Modified
2025-10-03 14:20
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: dsa: seville: register the mdiobus under devres
As explained in commits:
74b6d7d13307 ("net: dsa: realtek: register the MDIO bus under devres")
5135e96a3dd2 ("net: dsa: don't allocate the slave_mii_bus using devres")
mdiobus_free() will panic when called from devm_mdiobus_free() <-
devres_release_all() <- __device_release_driver(), and that mdiobus was
not previously unregistered.
The Seville VSC9959 switch is a platform device, so the initial set of
constraints that I thought would cause this (I2C or SPI buses which call
->remove on ->shutdown) do not apply. But there is one more which
applies here.
If the DSA master itself is on a bus that calls ->remove from ->shutdown
(like dpaa2-eth, which is on the fsl-mc bus), there is a device link
between the switch and the DSA master, and device_links_unbind_consumers()
will unbind the seville switch driver on shutdown.
So the same treatment must be applied to all DSA switch drivers, which
is: either use devres for both the mdiobus allocation and registration,
or don't use devres at all.
The seville driver has a code structure that could accommodate both the
mdiobus_unregister and mdiobus_free calls, but it has an external
dependency upon mscc_miim_setup() from mdio-mscc-miim.c, which calls
devm_mdiobus_alloc_size() on its behalf. So rather than restructuring
that, and exporting yet one more symbol mscc_miim_teardown(), let's work
with devres and replace of_mdiobus_register with the devres variant.
When we use all-devres, we can ensure that devres doesn't free a
still-registered bus (it either runs both callbacks, or none).
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 5.17 | |
| linux | linux_kernel | 5.17 | |
| linux | linux_kernel | 5.17 |
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: seville: register the mdiobus under devres\n\nAs explained in commits:\n74b6d7d13307 (\"net: dsa: realtek: register the MDIO bus under devres\")\n5135e96a3dd2 (\"net: dsa: don\u0027t allocate the slave_mii_bus using devres\")\n\nmdiobus_free() will panic when called from devm_mdiobus_free() \u003c-\ndevres_release_all() \u003c- __device_release_driver(), and that mdiobus was\nnot previously unregistered.\n\nThe Seville VSC9959 switch is a platform device, so the initial set of\nconstraints that I thought would cause this (I2C or SPI buses which call\n-\u003eremove on -\u003eshutdown) do not apply. But there is one more which\napplies here.\n\nIf the DSA master itself is on a bus that calls -\u003eremove from -\u003eshutdown\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 seville 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\u0027t use devres at all.\n\nThe seville driver has a code structure that could accommodate both the\nmdiobus_unregister and mdiobus_free calls, but it has an external\ndependency upon mscc_miim_setup() from mdio-mscc-miim.c, which calls\ndevm_mdiobus_alloc_size() on its behalf. So rather than restructuring\nthat, and exporting yet one more symbol mscc_miim_teardown(), let\u0027s work\nwith devres and replace of_mdiobus_register with the devres variant.\nWhen we use all-devres, we can ensure that devres doesn\u0027t free a\nstill-registered bus (it either runs both callbacks, or none)."
},
{
"lang": "es",
"value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: net: dsa: seville: registrar el mdiobus bajo devres Como se explica en commits: 74b6d7d13307 (\"net: dsa: realtek: registrar el bus MDIO bajo 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() \u0026lt;- devres_release_all() \u0026lt;- __device_release_driver(), y ese mdiobus no fue anulado previamente. El conmutador Sevilla VSC9959 es un dispositivo de plataforma, por lo que el conjunto inicial de restricciones que pens\u00e9 que causar\u00edan esto (buses I2C o SPI que llaman -\u0026gt;eliminar encendido -\u0026gt;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 -\u0026gt;remove from -\u0026gt;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 de Sevilla 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 Sevilla tiene una estructura de c\u00f3digo que podr\u00eda acomodar las llamadas mdiobus_unregister y mdiobus_free, pero tiene una dependencia externa de mscc_miim_setup() de mdio-mscc-miim.c, que llama a devm_mdiobus_alloc_size() en su nombre. Entonces, en lugar de reestructurar eso y exportar un s\u00edmbolo m\u00e1s mscc_miim_teardown(), trabajemos con devres y reemplacemos of_mdiobus_register con la variante devres. Cuando usamos all-devres, podemos asegurarnos de que devres no libere un bus a\u00fan registrado (ejecuta ambas devoluciones de llamada o ninguna)."
}
],
"id": "CVE-2022-48814",
"lastModified": "2025-10-03T14:20:42.190",
"metrics": {
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
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"source": "nvd@nist.gov",
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"published": "2024-07-16T12:15:05.563",
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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