[FFmpeg-trac] #8177(undetermined:new): four division by zero bugs in aaccoder.c and lpc.h

FFmpeg trac at avcodec.org
Wed Sep 18 22:21:50 EEST 2019


#8177: four division by zero bugs in aaccoder.c and lpc.h
-------------------------------------+-------------------------------------
             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 four division by zero bugs in aaccoder.c and lpc.h
 {{{
 libavcodec/aaccoder.c:846:60: runtime error: division by zero
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libavcodec/aaccoder.c:846:60 in
 libavcodec/aaccoder.c:858:60: runtime error: division by zero
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libavcodec/aaccoder.c:858:60 in
 libavcodec/aaccoder.c:864:62: runtime error: division by zero
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libavcodec/aaccoder.c:864:62 in
 libavcodec/lpc.h:155:27: runtime error: division by zero
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libavcodec/lpc.h:155:27 in
 }}}

 How to reproduce:
 {{{
 % ./ffmpeg_g -stream_loop 1 -y -r 83 -i surge-2-16-B-ima4.mov -loglevel 0
 -map 0 -vframes 4 -aframes 74 -strict 3 tmp.m4a

 ffmpeg version N-94961-g1d86e4b3eb Copyright (c) 2000-2019 the FFmpeg
 developers
   built with clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
   configuration: --cc=clang --cxx=clang++ --ld=clang --enable-debug
 --toolchain=clang-usan
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8177>
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