[FFmpeg-trac] #8144(undetermined:new): left shift of negative value bug in libavcodec/ac3enc.c

[FFmpeg]

#8144: left shift of negative value bug in libavcodec/ac3enc.c
-------------------------------------+-------------------------------------
             Reporter:  Suhwan       |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  ubsan        |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 There's left shift of negative value bug in libavcodec/ac3enc.c
 {{{
 libavcodec/ac3enc.c:1068:37: runtime error: left shift of negative value
 -32
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libavcodec/ac3enc.c:1068:37 in
 }}}
 How to reproduce:
 {{{
 % ./ffmpeg_g -t 1 -y -r 61 -i pokem.avi -target dvd -map 0 -aframes 91 -r
 114 -ab 123k -ar 48000 -ac 20 output/tmp.aiff

 ffmpeg version N-94887-ge55018ee11 (git master)
 built on ... ubuntu 18.04 with clang-6 and UBSAN option.
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/8144>
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