cve-2022-48814
Vulnerability from cvelistv5
Published
2024-07-16 11:44
Modified
2024-11-04 12:17
Severity ?
Summary
net: dsa: seville: register the mdiobus under devres
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0e816362d823cd46c666e64d8bffe329ee22f4cc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1d13e7221035947c62800c9d3d99b4ed570e27e7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bd488afc3b39e045ba71aab472233f2a78726e7b
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0e816362d823cd46c666e64d8bffe329ee22f4cc
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1d13e7221035947c62800c9d3d99b4ed570e27e7
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/bd488afc3b39e045ba71aab472233f2a78726e7b
Impacted products
Vendor Product Version
Linux Linux Version: 5.9
Show details on NVD website

To clipboard 

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                "id": "CVE-2022-48814",
                "options": [
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                    "Exploitation": "none"
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                    "Automatable": "no"
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    "cna": {
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          "product": "Linux",
          "programFiles": [
            "drivers/net/dsa/ocelot/seville_vsc9953.c"
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          "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)."
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    "cveId": "CVE-2022-48814",
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    "dateReserved": "2024-07-16T11:38:08.899Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-48814\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-07-16T12:15:05.563\",\"lastModified\":\"2024-11-21T07:34:08.330\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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).\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0e816362d823cd46c666e64d8bffe329ee22f4cc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1d13e7221035947c62800c9d3d99b4ed570e27e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd488afc3b39e045ba71aab472233f2a78726e7b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0e816362d823cd46c666e64d8bffe329ee22f4cc\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/1d13e7221035947c62800c9d3d99b4ed570e27e7\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/bd488afc3b39e045ba71aab472233f2a78726e7b\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
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}


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