[FFmpeg-trac] #8848(ffmpeg:new): A memory leak in ffmpeg

[FFmpeg]

#8848: A memory leak in ffmpeg
-------------------------------------+-------------------------------------
             Reporter:  MoonLight-   |                     Type:  defect
  SteinsGate                         |
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:
                                     |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: A memory leak in function av_malloc of
 libavutil/mem.c:87
 How to reproduce:
 {{{
 % ffmpeg -i PoC
 ffmpeg version is ffmpeg-4.1.3
 built on Ubuntu 16.04.
 }}}
 I have found the bug by fuzzing. I compile ffmpeg-4.1.3 to x86-64 version
 with address sanitizer in Ubuntu-16.04 and print the debug information as:

 ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
   built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
   configuration: --disable-stripping
 --prefix=/home/ubuntu/yuetai/asan_programs/ffmpeg-4.1.3/ffmpeg-install/
   libavutil      56. 22.100 / 56. 22.100
   libavcodec     58. 35.100 / 58. 35.100
   libavformat    58. 20.100 / 58. 20.100
   libavdevice    58.  5.100 / 58.  5.100
   libavfilter     7. 40.101 /  7. 40.101
   libswscale      5.  3.100 /  5.  3.100
   libswresample   3.  3.100 /  3.  3.100
 [dv @ 0x61b000000080] Format dv detected only with low score of 25,
 misdetection possible!
 ./crashes/avconv/seeds/queue/id:088235,src:077720,op:havoc,rep:64:
 Input/output error

 =================================================================
 ==28203==ERROR: LeakSanitizer: detected memory leaks

 Direct leak of 33192 byte(s) in 1 object(s) allocated from:
     #0 0x7fc545a3c790 in posix_memalign (/usr/lib/x86_64-linux-
 gnu/libasan.so.4+0xdf790)
     #1 0x555a0a559cdc in av_malloc libavutil/mem.c:87

 SUMMARY: AddressSanitizer: 33192 byte(s) leaked in 1 allocation(s).

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Ticket URL: <https://trac.ffmpeg.org/ticket/8848>
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