[FFmpeg-trac] #7015(avutil:closed): UBSan: libavutil/eval.c:318:77: runtime error: division by zero

[FFmpeg]

#7015: UBSan: libavutil/eval.c:318:77: runtime error: division by zero
------------------------------------+--------------------------------------
             Reporter:  tsmith      |                    Owner:
                 Type:  defect      |                   Status:  closed
             Priority:  normal      |                Component:  avutil
              Version:  git-master  |               Resolution:  worksforme
             Keywords:  ubsan       |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+--------------------------------------
Changes (by richardpl):

 * status:  new => closed
 * resolution:   => worksforme


Comment:

 Not reproducible with clang 6.0:
 {{{
 ffmpeg -i ~/Downloads/test.flac -f null -
 ffmpeg version N-92703-gc6e1966c1a Copyright (c) 2000-2018 the FFmpeg
 developers
   built with clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
   configuration: --cc='ccache clang' --as='ccache clang' --disable-indevs
 --disable-outdevs --disable-autodetect --enable-gpl --enable-libpulse
 --enable-indev=lavfi --enable-indev=alsa --enable-indev=pulse --enable-
 nonfree --en
 able-zlib --enable-openssl --enable-outdev=alsa --disable-static --enable-
 shared --enable-ladspa --enable-lv2 --enable-libbs2b --enable-libmp3lame
 --enable-librubberband --enable-libmysofa --enable-libx264 --enable-
 fontconfig -
 -enable-libilbc --enable-libaom --enable-libfreetype --enable-libass
 --enable-libzimg --disable-stripping --samples=../fate-suite
   libavutil      56. 24.101 / 56. 24.101
   libavcodec     58. 42.101 / 58. 42.101
   libavformat    58. 24.101 / 58. 24.101
   libavdevice    58.  6.101 / 58.  6.101
   libavfilter     7. 46.101 /  7. 46.101
   libswscale      5.  4.100 /  5.  4.100
   libswresample   3.  4.100 /  3.  4.100
   libpostproc    55.  4.100 / 55.  4.100
 [flac @ 0xf33e00] Could not find codec parameters for stream 0 (Audio:
 flac, mono, s16 (5 bit)): unspecified sample rate
 Consider increasing the value for the 'analyzeduration' and 'probesize'
 options
 Input #0, flac, from '/home/computer/Downloads/test.flac':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Audio: flac, mono, s16 (5 bit)
 Stream mapping:
   Stream #0:0 -> #0:0 (flac (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 [abuffer @ 0x1072340] Value inf for parameter 'time_base' out of range [0
 - 2.14748e+09]
     Last message repeated 3 times
 [abuffer @ 0x1072340] Error setting option time_base to value 1/0.
 [graph_0_in_0_0 @ 0x1072240] Error applying options to the filter.
 Error reinitializing filters!
 Error while filtering: Numerical result out of range
 Finishing stream 0:0 without any data written to it.
 [abuffer @ 0x1073f00] Value inf for parameter 'time_base' out of range [0
 - 2.14748e+09]
     Last message repeated 3 times
 [abuffer @ 0x1073f00] Error setting option time_base to value 1/0.
 [graph_0_in_0_0 @ 0x1073dc0] Error applying options to the filter.
 Error configuring filter graph
 Conversion failed!
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7015#comment:2>
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