Linux Kernel HDMI Encoder Refcount Leak Vulnerability

A refcount leak vulnerability has been identified in the Linux kernel's HDMI encoder for the DRM (Direct Rendering Manager) subsystem, specifically within the Amlogic (meson) graphics driver. The issue arises in the function 'meson_encoder_hdmi_initof_graph_get_remote_node()', which returns a pointer to a remote device node with an incremented reference count. The vulnerability occurs because the corresponding 'of_node_put()' function was not called to decrement the reference count, leading to a memory leak. This vulnerability affects several versions of the Linux kernel.

Impact

Exploitation of this vulnerability leads to a memory leak, where reference counts are not properly managed, potentially causing increased memory usage and degradation of system performance over time.