outside the range of int at libavfilter/vf_ciescope.c

[Suhwan]

Summary of the bug:
There are 2 outside the range of int and 2 integer division by zero at libavfilter/vf_ciescope.c

I compiled ffmpeg with "--toolchain=clang-usan" to check the undefined-behaviours and attached log file.
How to reproduce:

% ffmpeg_g -y -i $PoC -filter_complex ciescope -target dv -loglevel 0 tmp.bit

ffmpeg version N-95343-ge835a9d302 Copyright (c) 2000-2019 the FFmpeg developers
built with clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
configuration: --cc=clang --cxx=clang++ --ld=clang --enable-debug --toolchain=clang-usan

Here's UBSAN log

libavfilter/vf_ciescope.c:853:13: runtime error: division by zero
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior libavfilter/vf_ciescope.c:853:13 in 
libavfilter/vf_ciescope.c:854:13: runtime error: division by zero
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior libavfilter/vf_ciescope.c:854:13 in 
libavfilter/vf_ciescope.c:1405:18: runtime error: -nan is outside the range of representable values of type 'int'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior libavfilter/vf_ciescope.c:1405:18 in 
libavfilter/vf_ciescope.c:1406:18: runtime error: -nan is outside the range of representable values of type 'int'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior libavfilter/vf_ciescope.c:1406:18 in 

Please confirm.
Thanks

[Suhwan]

poc

[Elon Musk]

Fixed in 3d500e62f6206ad11308b18976246366aed8c1a5