CVE-2022-48975 (GCVE-0-2022-48975)
Vulnerability from cvelistv5
Published
2024-10-21 20:05
Modified
2026-05-11 18:50
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: gpiolib: fix memory leak in gpiochip_setup_dev() Here is a backtrace report about memory leak detected in gpiochip_setup_dev(): unreferenced object 0xffff88810b406400 (size 512): comm "python3", pid 1682, jiffies 4295346908 (age 24.090s) backtrace: kmalloc_trace device_add device_private_init at drivers/base/core.c:3361 (inlined by) device_add at drivers/base/core.c:3411 cdev_device_add gpiolib_cdev_register gpiochip_setup_dev gpiochip_add_data_with_key gcdev_register() & gcdev_unregister() would call device_add() & device_del() (no matter CONFIG_GPIO_CDEV is enabled or not) to register/unregister device. However, if device_add() succeeds, some resource (like struct device_private allocated by device_private_init()) is not released by device_del(). Therefore, after device_add() succeeds by gcdev_register(), it needs to call put_device() to release resource in the error handle path. Here we move forward the register of release function, and let it release every piece of resource by put_device() instead of kfree(). While at it, fix another subtle issue, i.e. when gc->ngpio is equal to 0, we still call kcalloc() and, in case of further error, kfree() on the ZERO_PTR pointer, which is not NULL. It's not a bug per se, but rather waste of the resources and potentially wrong expectation about contents of the gdev->descs variable.
References
Impacted products
Vendor Product Version
Linux Linux Version: 159f3cd92f17c61a4e2a47456de5865b114ef88e
Version: 159f3cd92f17c61a4e2a47456de5865b114ef88e
Version: 159f3cd92f17c61a4e2a47456de5865b114ef88e
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpiolib: fix memory leak in gpiochip_setup_dev()\n\nHere is a backtrace report about memory leak detected in\ngpiochip_setup_dev():\n\nunreferenced object 0xffff88810b406400 (size 512):\n  comm \"python3\", pid 1682, jiffies 4295346908 (age 24.090s)\n  backtrace:\n    kmalloc_trace\n    device_add\t\tdevice_private_init at drivers/base/core.c:3361\n\t\t\t(inlined by) device_add at drivers/base/core.c:3411\n    cdev_device_add\n    gpiolib_cdev_register\n    gpiochip_setup_dev\n    gpiochip_add_data_with_key\n\ngcdev_register() \u0026 gcdev_unregister() would call device_add() \u0026\ndevice_del() (no matter CONFIG_GPIO_CDEV is enabled or not) to\nregister/unregister device.\n\nHowever, if device_add() succeeds, some resource (like\nstruct device_private allocated by device_private_init())\nis not released by device_del().\n\nTherefore, after device_add() succeeds by gcdev_register(), it\nneeds to call put_device() to release resource in the error handle\npath.\n\nHere we move forward the register of release function, and let it\nrelease every piece of resource by put_device() instead of kfree().\n\nWhile at it, fix another subtle issue, i.e. when gc-\u003engpio is equal\nto 0, we still call kcalloc() and, in case of further error, kfree()\non the ZERO_PTR pointer, which is not NULL. It\u0027s not a bug per se,\nbut rather waste of the resources and potentially wrong expectation\nabout contents of the gdev-\u003edescs variable."
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    "datePublished": "2024-10-21T20:05:55.091Z",
    "dateReserved": "2024-08-22T01:27:53.631Z",
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    "state": "PUBLISHED"
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