Linux Kernel Refcount Leak Vulnerability in PM/devfreq Exynos PPMU

A refcount leak vulnerability has been identified in the Linux kernel's PM/devfreq subsystem, specifically within the Exynos PPMU component. The issue arises because the function 'of_get_devfreq_events_of_get_child_by_name()' returns a node pointer with an incremented reference count, which is not properly decremented in error paths, leading to a memory leak. The vulnerability has been addressed by adding the missing 'of_node_put()' call in the error handling paths.

Impact

Exploitation of this vulnerability could lead to a memory refcount leak, potentially causing memory management issues such as use-after-free vulnerabilities.