[FFmpeg-trac] #8214(undetermined:new): signed integer overflow in libswscale/output.c

FFmpeg trac at avcodec.org
Tue Oct 1 17:57:55 EEST 2019


#8214: signed integer overflow in libswscale/output.c
-------------------------------------+-------------------------------------
             Reporter:  Suhwan       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  ubsan        |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 There're 2 signed integer overflow in libswscale/output.c
 {{{
 libswscale/output.c:2202:15: runtime error: signed integer overflow:
 1169365504 + 989071450 cannot be represented in type 'int'
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libswscale/output.c:2202:15 in
 libswscale/output.c:2204:15: runtime error: signed integer overflow:
 1169365504 + 1056691125 cannot be represented in type 'int'
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libswscale/output.c:2204:15 in
 }}}
 How to reproduce:
 {{{
 % ./ffmpeg_g -t 1 -y -i base5_dancer.cmp -loglevel 0 -map 0 -vframes 38
 -ab 840k -b:v 479k -strict 2 tmp.fits

 ffmpeg version N-95160-g9fdc2c7bc4 Copyright (c) 2000-2019 the FFmpeg
 developers
   built with clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
   configuration: --cc=afl-clang --cxx=afl-clang++ --ld=afl-clang --enable-
 debug --toolchain=clang-usan

 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8214>
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