[FFmpeg-trac] #8230(avformat:new): avformat_open_input leaks memory

[FFmpeg]

#8230: avformat_open_input leaks memory
----------------------------------+----------------------------------
             Reporter:  justinas  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  4.1.4
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
----------------------------------+----------------------------------
 Summary of the bug:
 How to reproduce:
 {{{
 AVFormatContext* fmt_ctx = NULL;
 avformat_open_input(&fmt_ctx, "/usr/bin/ntpd", NULL, NULL);
 }}}

 In my system an attempt to read /usr/bin/ntpd yields "Operation not
 permitted", however at this point FFMPEG has already tentatively decided
 that this is a dv input stream. See below:

 {{{
 ffprobe version n4.2 Copyright (c) 2007-2019 the FFmpeg developers
   built with gcc 9.1.0 (GCC)
   configuration: --prefix=/usr --disable-debug --disable-static --disable-
 stripping --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl
 --enable-ladspa --enable-libaom --enable-libass --enable-libbluray
 --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi
 --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmodplug
 --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb
 --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr
 --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2
 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp
 --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2
 --enable-libxvid --enable-nvdec --enable-nvenc --enable-omx --enable-
 shared --enable-version3
   libavutil      56. 31.100 / 56. 31.100
   libavcodec     58. 54.100 / 58. 54.100
   libavformat    58. 29.100 / 58. 29.100
   libavdevice    58.  8.100 / 58.  8.100
   libavfilter     7. 57.100 /  7. 57.100
   libswscale      5.  5.100 /  5.  5.100
   libswresample   3.  5.100 /  3.  5.100
   libpostproc    55.  5.100 / 55.  5.100
 [dv @ 0x556a892d7640] Format dv detected only with low score of 25,
 misdetection possible!
 [dv @ 0x556a892d7640] Can't determine profile of DV input stream.
 /usr/bin/ntpd: Operation not permitted
 }}}

 Since file operations are not permitted, avformat_open_input bails out but
 does not fully free the allocated format context. LeakSanitizer reports a
 single allocation leak around 32000 bytes.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8230>
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