CVE-2022-48975 (GCVE-0-2022-48975)

Vulnerability from cvelistv5 – Published: 2024-10-21 20:05 – Updated: 2025-05-04 08:27
VLAI?
Title
gpiolib: fix memory leak in gpiochip_setup_dev()
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 159f3cd92f17c61a4e2a47456de5865b114ef88e , < 6daaa84b621485fe28c401be18debf92ae8ef04a (git)
Affected: 159f3cd92f17c61a4e2a47456de5865b114ef88e , < 371363716398ed718e389bea8c5e9843a79dde4e (git)
Affected: 159f3cd92f17c61a4e2a47456de5865b114ef88e , < ec851b23084b3a0af8bf0f5e51d33a8d678bdc49 (git)
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    Linux Linux Affected: 4.6
Unaffected: 0 , < 4.6 (semver)
Unaffected: 5.15.83 , ≤ 5.15.* (semver)
Unaffected: 6.0.13 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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