heap-buffer-overflow in vp9 superframe filter

heap-buffer-overflow in vp9 superframe filter: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). AddressSanitizer: heap-buffer-overflow in function vp9 superframe filter in file ffmpeg/libavcodec/vp9 superframe bsf.c