CVE-2024-53201

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Fix null check for pipe_ctx->plane_state in dcn20_program_pipe

This commit addresses a null pointer dereference issue in

dcn20_program_pipe(). Previously, commit 8e4ed3cf1642 ("drm/amd/display:

Add null check for pipe_ctx->plane_state in dcn20_program_pipe")

partially fixed the null pointer dereference issue. However, in

dcn20_update_dchubp_dpp(), the variable pipe_ctx is passed in, and

plane_state is accessed again through pipe_ctx. Multiple if statements

directly call attributes of plane_state, leading to potential null

pointer dereference issues. This patch adds necessary null checks to

ensure stability.