Linux Kernel Refcount Leak Vulnerability in Lantiq GSWIP DSA Driver

A refcount leak vulnerability has been identified in the Lantiq GSWIP DSA driver of the Linux kernel. The issue arises because the function 'for_each_available_child_of_node()' decrements the reference count of the previous node with each iteration. When the loop is exited early, the reference count of the last node is not properly released, leading to a memory leak. The vulnerability has been addressed by adding the missing 'of_node_put()' call to ensure the reference count is correctly managed.

Impact

Exploitation of this vulnerability could lead to a memory leak, where reference counts are not properly released, potentially causing increased memory usage and related issues.