cve-2021-47436
Vulnerability from cvelistv5
Published
2024-05-22 06:19
Modified
2024-11-04 11:41
Severity ?
Summary
usb: musb: dsps: Fix the probe error path
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5ed60a430fb5f3d93e7fef66264daef466b4d10c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9ab5d539bc975b8dcde86eca1b58d836b657732e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9d89e287116796bf987cc48f5c8632ef3048f8eb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c2115b2b16421d93d4993f3fe4c520e91d6fe801
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e923bce31ffefe4f60edfc6b84f62d4a858f3676
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff9249aab39820be11b6975a10d94253b7d426fc
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: musb: dsps: Fix the probe error path\n\nCommit 7c75bde329d7 (\"usb: musb: musb_dsps: request_irq() after\ninitializing musb\") has inverted the calls to\ndsps_setup_optional_vbus_irq() and dsps_create_musb_pdev() without\nupdating correctly the error path. dsps_create_musb_pdev() allocates and\nregisters a new platform device which must be unregistered and freed\nwith platform_device_unregister(), and this is missing upon\ndsps_setup_optional_vbus_irq() error.\n\nWhile on the master branch it seems not to trigger any issue, I observed\na kernel crash because of a NULL pointer dereference with a v5.10.70\nstable kernel where the patch mentioned above was backported. With this\nkernel version, -EPROBE_DEFER is returned the first time\ndsps_setup_optional_vbus_irq() is called which triggers the probe to\nerror out without unregistering the platform device. Unfortunately, on\nthe Beagle Bone Black Wireless, the platform device still living in the\nsystem is being used by the USB Ethernet gadget driver, which during the\nboot phase triggers the crash.\n\nMy limited knowledge of the musb world prevents me to revert this commit\nwhich was sent to silence a robot warning which, as far as I understand,\ndoes not make sense. The goal of this patch was to prevent an IRQ to\nfire before the platform device being registered. I think this cannot\never happen due to the fact that enabling the interrupts is done by the\n-\u003eenable() callback of the platform musb device, and this platform\ndevice must be already registered in order for the core or any other\nuser to use this callback.\n\nHence, I decided to fix the error path, which might prevent future\nerrors on mainline kernels while also fixing older ones."
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    "datePublished": "2024-05-22T06:19:32.220Z",
    "dateReserved": "2024-05-21T14:58:30.830Z",
    "dateUpdated": "2024-11-04T11:41:15.170Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47436\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-22T07:15:08.883\",\"lastModified\":\"2024-05-22T12:46:53.887\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: musb: dsps: Fix the probe error path\\n\\nCommit 7c75bde329d7 (\\\"usb: musb: musb_dsps: request_irq() after\\ninitializing musb\\\") has inverted the calls to\\ndsps_setup_optional_vbus_irq() and dsps_create_musb_pdev() without\\nupdating correctly the error path. dsps_create_musb_pdev() allocates and\\nregisters a new platform device which must be unregistered and freed\\nwith platform_device_unregister(), and this is missing upon\\ndsps_setup_optional_vbus_irq() error.\\n\\nWhile on the master branch it seems not to trigger any issue, I observed\\na kernel crash because of a NULL pointer dereference with a v5.10.70\\nstable kernel where the patch mentioned above was backported. With this\\nkernel version, -EPROBE_DEFER is returned the first time\\ndsps_setup_optional_vbus_irq() is called which triggers the probe to\\nerror out without unregistering the platform device. Unfortunately, on\\nthe Beagle Bone Black Wireless, the platform device still living in the\\nsystem is being used by the USB Ethernet gadget driver, which during the\\nboot phase triggers the crash.\\n\\nMy limited knowledge of the musb world prevents me to revert this commit\\nwhich was sent to silence a robot warning which, as far as I understand,\\ndoes not make sense. The goal of this patch was to prevent an IRQ to\\nfire before the platform device being registered. I think this cannot\\never happen due to the fact that enabling the interrupts is done by the\\n-\u003eenable() callback of the platform musb device, and this platform\\ndevice must be already registered in order for the core or any other\\nuser to use this callback.\\n\\nHence, I decided to fix the error path, which might prevent future\\nerrors on mainline kernels while also fixing older ones.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: musb: dsps: corrige la ruta del error de la sonda. El commit 7c75bde329d7 (\\\"usb: musb: musb_dsps: request_irq() despu\u00e9s de inicializar musb\\\") ha invertido las llamadas a dsps_setup_optional_vbus_irq() y dsps_create_musb_pdev() sin actualizar correctamente la ruta del error. dsps_create_musb_pdev() asigna y registra un nuevo dispositivo de plataforma que debe cancelarse y liberarse con platform_device_unregister(), y esto falta en el error dsps_setup_optional_vbus_irq(). Mientras que en la rama maestra parece no desencadenar ning\u00fan problema, observ\u00e9 un bloqueo del kernel debido a una desreferencia del puntero NULL con un kernel estable v5.10.70 donde el parche mencionado anteriormente estaba respaldado. Con esta versi\u00f3n del kernel, se devuelve -EPROBE_DEFER la primera vez que se llama a dsps_setup_optional_vbus_irq(), lo que provoca que la sonda genere un error sin cancelar el registro del dispositivo de plataforma. Desafortunadamente, en el Beagle Bone Black Wireless, el dispositivo de plataforma que a\u00fan se encuentra en el sistema est\u00e1 siendo utilizado por el controlador del dispositivo USB Ethernet, lo que durante la fase de arranque provoca el bloqueo. Mi conocimiento limitado del mundo musb me impide revertir este compromiso que fue enviado para silenciar una advertencia de robot que, hasta donde tengo entendido, no tiene sentido. El objetivo de este parche era evitar que se activara una IRQ antes de que se registrara el dispositivo de la plataforma. Creo que esto nunca puede suceder debido al hecho de que habilitar las interrupciones se realiza mediante la devoluci\u00f3n de llamada -\u0026gt;enable() del dispositivo musb de la plataforma, y este dispositivo de plataforma ya debe estar registrado para que el n\u00facleo o cualquier otro usuario pueda usar esto. llamar de vuelta. Por lo tanto, decid\u00ed corregir la ruta del error, lo que podr\u00eda evitar futuros errores en los n\u00facleos principales y al mismo tiempo corregir los m\u00e1s antiguos.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5ed60a430fb5f3d93e7fef66264daef466b4d10c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9ab5d539bc975b8dcde86eca1b58d836b657732e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9d89e287116796bf987cc48f5c8632ef3048f8eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c2115b2b16421d93d4993f3fe4c520e91d6fe801\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e923bce31ffefe4f60edfc6b84f62d4a858f3676\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ff9249aab39820be11b6975a10d94253b7d426fc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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}


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