[FFmpeg-trac] #8143(undetermined:new): left shift of negative value in libavformat/rmdec.c

FFmpeg trac at avcodec.org
Sun Sep 15 05:44:28 EEST 2019


#8143: left shift of negative value in libavformat/rmdec.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 a left shift of negative value bug in libavformat/rmdec.c:727:41
 {{{
 libavformat/rmdec.c:727:41: runtime error: left shift of negative value -1
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libavformat/rmdec.c:727:41 in
 }}}
 How to reproduce:
 {{{
 % ./ffmpeg_g -y -i thankyou.rm -map 0 -c copy -c: v:79 targa -disposition:
 a:122 dpx -disposition: v:100 pcm_vidc -vframes 73 -aframes 50 -r 17 -ab
 724k -ar 22050 -ac 10 -strict 0 output/tmp.ffmetadata

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

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8143>
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