cve-2021-47436
Vulnerability from cvelistv5
Published
2024-05-22 06:19
Modified
2024-12-19 07:41
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: musb: dsps: Fix the probe error path Commit 7c75bde329d7 ("usb: musb: musb_dsps: request_irq() after initializing musb") has inverted the calls to dsps_setup_optional_vbus_irq() and dsps_create_musb_pdev() without updating correctly the error path. dsps_create_musb_pdev() allocates and registers a new platform device which must be unregistered and freed with platform_device_unregister(), and this is missing upon dsps_setup_optional_vbus_irq() error. While on the master branch it seems not to trigger any issue, I observed a kernel crash because of a NULL pointer dereference with a v5.10.70 stable kernel where the patch mentioned above was backported. With this kernel version, -EPROBE_DEFER is returned the first time dsps_setup_optional_vbus_irq() is called which triggers the probe to error out without unregistering the platform device. Unfortunately, on the Beagle Bone Black Wireless, the platform device still living in the system is being used by the USB Ethernet gadget driver, which during the boot phase triggers the crash. My limited knowledge of the musb world prevents me to revert this commit which was sent to silence a robot warning which, as far as I understand, does not make sense. The goal of this patch was to prevent an IRQ to fire before the platform device being registered. I think this cannot ever happen due to the fact that enabling the interrupts is done by the ->enable() callback of the platform musb device, and this platform device must be already registered in order for the core or any other user to use this callback. Hence, I decided to fix the error path, which might prevent future errors on mainline kernels while also fixing older ones.
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
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5ed60a430fb5f3d93e7fef66264daef466b4d10c
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9ab5d539bc975b8dcde86eca1b58d836b657732e
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9d89e287116796bf987cc48f5c8632ef3048f8eb
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c2115b2b16421d93d4993f3fe4c520e91d6fe801
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e923bce31ffefe4f60edfc6b84f62d4a858f3676
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ff9249aab39820be11b6975a10d94253b7d426fc
Impacted products
Vendor Product Version
Linux Linux Version: 4.14.247   ≤
Version: 4.19.207   ≤
Version: 5.4.148   ≤
Version: 5.10.67   ≤
Version: 5.14.6   ≤
Show details on NVD website

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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. 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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\"},{\"url\":\"https://git.kernel.org/stable/c/5ed60a430fb5f3d93e7fef66264daef466b4d10c\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/9ab5d539bc975b8dcde86eca1b58d836b657732e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/9d89e287116796bf987cc48f5c8632ef3048f8eb\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/c2115b2b16421d93d4993f3fe4c520e91d6fe801\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/e923bce31ffefe4f60edfc6b84f62d4a858f3676\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/ff9249aab39820be11b6975a10d94253b7d426fc\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
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