[FFmpeg-trac] #6160(avformat:new): Valgrind error in mpegps_read_header

[FFmpeg]

#6160: Valgrind error in mpegps_read_header
----------------------------------+---------------------------------------
             Reporter:  mi        |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  unspecified
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 I noticed strange crashes working on my own code and attempted to run it
 under valgrind. The error reported by the tool is there even with the
 stock ffmpeg-executable -- without my code in the equation.

 How to reproduce:
 {{{
 % valgrind ffmpeg -i robot.avi
 ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
   built with FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final
 208032) 20140512
 ...
 ==52950== Conditional jump or move depends on uninitialised value(s)
 ==52950==    at 0x554F02F: mpegps_read_header (mpeg.c:148)
 ==52950==    by 0x55D43DA: avformat_open_input (utils.c:593)
 ==52950==    by 0x40F881: ??? (in /opt/bin/ffmpeg)
 ==52950==    by 0x40F10C: ??? (in /opt/bin/ffmpeg)
 ==52950==    by 0x40EE93: ??? (in /opt/bin/ffmpeg)
 ==52950==    by 0x41AC7B: ??? (in /opt/bin/ffmpeg)
 ==52950==    by 0x408F8E: ??? (in /opt/bin/ffmpeg)
 ==52950==    by 0x4020FFF: ???
 ==52950==
 }}}

 The reported line mpeg.c:148 reads:
 {{{
     if (!memcmp("IMKH", buffer, 4)) {
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6160>
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