[FFmpeg-trac] #8166(undetermined:new): left shift of negative value bugs in libswscale/swscale.c

[FFmpeg]

#8166: left shift of negative value bugs in libswscale/swscale.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're left shift of negative value bugs in libswscale/swscale.c
 {{{
 libswscale/swscale.c:301:18: runtime error: left shift of negative value
 -1056
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libswscale/swscale.c:301:18 in
 libswscale/swscale.c:302:18: runtime error: left shift of negative value
 -1056
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libswscale/swscale.c:302:18 in
 }}}
 How to reproduce:
 {{{
 % ./ffmpeg_g -t 3 -y -r 38 -i mszh_rgb24.avi -target dv -map 0 -aframes 37
 -r 105 -ar 48000 -ac 1 -strict 1 output/tmp.avi

 ffmpeg version N-94943-g1db6e47e85
 built on ubuntu 18.04 with clang-6 and UBSAN option.
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/8166>
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