[FFmpeg-trac] #8594(avformat:new): Infinite loop in ogg_read_header

[FFmpeg]

#8594: Infinite loop in ogg_read_header
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  andreafioraldi                     |
               Status:  new          |                 Priority:  normal
            Component:  avformat     |                  Version:  git-
                                     |  master
             Keywords:  hang         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 Hi, I found an input taht causes an infinite loop.
 In the details, the code that loops is in
 libavformat/oggdec.c:ogg_read_header().

 {{{
 static int ogg_read_header(AVFormatContext *s)
 {
     struct ogg *ogg = s->priv_data;
     int ret, i;

     ogg->curidx = -1;

     //linear headers seek from start
     do {
         ret = ogg_packet(s, NULL, NULL, NULL, NULL);
         if (ret < 0) {
             ogg_read_close(s);
             return ret;
         }
     } while (!ogg->headers);
     av_log(s, AV_LOG_TRACE, "found headers\n");

     // ...

 }}}

 The do while seems infinite. A attach a repro testcase.

 How to reproduce:
 {{{
 % ffmpeg -i
 id\:000000\,src\:004026\,time\:40571915+001319\,op\:MOpt_core_splice\,rep\:64
 a.mp3
 ffmpeg version N-97118-gfa164bc50e Copyright (c) 2000-2020 the FFmpeg
 developers
   built with clang version 10.0.0
 (git at github.com:andreafioraldi/ConstrainedMemorySanitizer.git
 5b365c37a959d429121850f6d91ed160d4cdf76f)
   configuration: --cc=clang-10 --cxx=clang++-10
   libavutil      56. 42.102 / 56. 42.102
   libavcodec     58. 77.101 / 58. 77.101
   libavformat    58. 42.100 / 58. 42.100
   libavdevice    58.  9.103 / 58.  9.103
   libavfilter     7. 77.101 /  7. 77.101
   libswscale      5.  6.101 /  5.  6.101
   libswresample   3.  6.100 /  3.  6.100
 [ogg @ 0x61b000000080] Codec not found
     Last message repeated 1 times

 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8594>
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