[FFmpeg-trac] #8149(undetermined:new): singed integer overflow in libavformat/avidec.c

FFmpeg trac at avcodec.org
Sun Sep 15 06:52:59 EEST 2019


#8149: singed integer overflow in libavformat/avidec.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 singed integer overflow in libavformat/avidec.c:1536:30
 {{{
 libavformat/avidec.c:1536:30: runtime error: signed integer overflow: 0 -
 -9223372036854775808 cannot be represented in type 'long'
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libavformat/avidec.c:1536:30 in
 }}}
 How to reproduce:
 {{{
 % ./ffmpeg_g -t 2 -stream_loop 14 -y -r 58 -i camcorder.avi -target dv
 -map 0 -vframes 91 -aframes 106 -r 16 -b:v 38k output/tmp.stl

 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/8149>
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