Linux Kernel Intel Display Encoder Vulnerability in DRM/I915

A vulnerability in the Linux kernel's DRM/I915 graphics driver has been addressed. The issue involved improperly handling the 'state' argument in encoder hooks, which could lead to a null reference and potential system crash. The vulnerability arose from the 'intel_sanitize_encoder()' function, which incorrectly passed null values, creating a risk of dereferencing errors. The fix involves retrieving the 'intel_display' directly from the encoder instead of the state, thereby avoiding the risk of a null dereference.

Impact

The vulnerability could lead to a system crash by dereferencing a null pointer, causing a kernel oops.