memcpy-param-overlap in cmap read palette

memcpy-param-overlap in cmap read palette: a task in MiMo-V2.6-RL-harbor-cyber: MiMo-V2.6-RL Cyber (Harbor) (Harbor dataset). AddressSanitizer: memcpy-param-overlap in function cmap read palette in file ffmpeg/libavcodec/iff.c