Linux Kernel Refcount Leak Vulnerability in Exynos PMU Node Mapping

A refcount leak vulnerability has been identified in the Linux kernel's handling of PMU node mapping for ARM Exynos. The issue arises in the function 'exynos_map_pmuof_find_matching_node()', which returns a pointer to a node with an incremented reference count. If this pointer is not properly released using 'of_node_put()', it can lead to a memory leak. The missing 'of_node_put()' call has been added to address this issue.

Impact

Exploitation of this vulnerability can lead to a memory leak, where reference counts are not properly managed, potentially causing increased memory usage or other related issues.