[FFmpeg-trac] #8219(undetermined:new): left shift of negative value bug in libswresample/audioconvert.c

[FFmpeg]

#8219: left shift of negative value bug in libswresample/audioconvert.c
-------------------------------------+-------------------------------------
             Reporter:  Suhwan       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  ubsan        |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 There is a left shift of negative value bugs in
 libswresample/audioconvert.c
 {{{
 libswresample/audioconvert.c:62:1: runtime error: left shift of negative
 value -1376
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libswresample/audioconvert.c:62:1 in
 libswresample/audioconvert.c:62:1: runtime error: left shift of negative
 value -5676
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libswresample/audioconvert.c:62:1 in
 libswresample/audioconvert.c:62:1: runtime error: left shift of negative
 value -12748
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libswresample/audioconvert.c:62:1 in
 libswresample/audioconvert.c:62:1: runtime error: left shift of negative
 value -15836
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libswresample/audioconvert.c:62:1 in
 }}}
 How to reproduce:
 {{{
 % ffmpeg_g -stream_loop 29 -y -i $PoC -loglevel 0 -map 0 -c:a:71 mp2
 -disposition:a:97 flv -disposition:s:18 apng -vframes 117 -aframes 67 -ab
 506k -b:v 888k -strict 3 tmp.sox

 ffmpeg version N-95199-g9847380f5f 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
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8219>
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