Linux Kernel Runtime Power Management Reference Count Leak Vulnerability

A vulnerability in the Linux kernel's DRM bridge component has been addressed. The issue arose because the 'pm_runtime_get_sync()' function could inadvertently increase the runtime power management counter even when it encountered an error, leading to a reference count leak. To resolve this, the function was replaced with 'pm_runtime_resume_and_get()', which does not alter the power management counter in case of an error. Additionally, a corresponding decrement was added in the error handling path to maintain a balanced counter.

Impact

This vulnerability could lead to a reference count leak in the runtime power management system, potentially causing improper management of power states and resources.