Linux Kernel Arizona MFD Driver Reference Count Leak Vulnerability

A vulnerability in the Linux kernel's Arizona MFD driver has been addressed. The issue was a reference count leak in the function 'arizona_clk32k_enable()'. The vulnerability arose because the function used 'pm_runtime_get_sync()', which improperly increased the reference count even when an error occurred. This leak could potentially lead to resource management issues.

Impact

The vulnerability could cause a reference count leak, leading to improper resource management.

Reproduction

The vulnerability can be reproduced by calling the 'arizona_clk32k_enable()' function in the Arizona MFD driver. The function will use 'pm_runtime_get_sync()', which increases the reference count incorrectly, even when it returns an error. This behavior creates a reference count leak that can be exploited.

Remediation

The vulnerability has been fixed by changing the function to use 'pm_runtime_resume_and_get()', which correctly manages the reference count. Users should update to the latest version of the Linux kernel where this fix has been applied.