[FFmpeg-trac] #8140(undetermined:new): left shift of negative value in libswscale/input.c

[FFmpeg]

#8140: left shift of negative value in libswscale/input.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're 4 UBSAN bugs which is left shift of negative value in
 libswscale/input.c

 {{{
 libswscale/input.c:317:42: runtime error: left shift of negative value
 -4865
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libswscale/input.c:317:42 in
 libswscale/input.c:317:71: runtime error: left shift of negative value
 -9528
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libswscale/input.c:317:71 in
 libswscale/input.c:318:71: runtime error: left shift of negative value
 -12061
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libswscale/input.c:318:71 in
 libswscale/input.c:318:100: runtime error: left shift of negative value
 -2332
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libswscale/input.c:318:100 in
 }}}

 How to reproduce:
 {{{
 % ./ffmpeg_g -loglevel 99 -stream_loop 17 -y -r 42 -i PONDS.tif -target
 svcd -map 0 -ab 196k -ar 22050 -ac 20 output/tmp.hls
 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/8140>
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