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Andreas Rheinhardt 88a19d6b4d avformat/matroskadec: Fix use-after-free when demuxing ProRes 
ProRes in Matroska is supposed to not contain the first atom header
(containing a size field and the tag "icpf") and therefore the Matroska
demuxer has to recreate it; this involves an allocation and copy, of
course. Whether the old buffer (containing the data without the atom
header) needs to be freed or not depends upon whether it is what was
directly read (in which case it is owned by an AVBuffer) or whether it
has been allocated when reversing the track's content compression (e.g.
zlib compression) that Matroska supports.

So there are three pointers involved: The one pointing to the directly
read data (owned by the AVBuffer), the one pointing to the currently
valid data (which coincides with the former if no content compression
needed to be reverted) and the one pointing to the new data with the
first atom header. The check for whether to free the second of these is
simply whether the first two are different.

This works mostly, but there is a complication: Some muxers don't strip
the first atom header away and in this case, it is also not reinserted
and no new buffer is allocated; instead, the second and the third
pointers agree. In this case, one must never free the second buffer.
Yet it is currently done if the track is e.g. zlib compressed.
This commit fixes this.

This is a regression since b8e75a2a.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
(cherry picked from commit af50f0a515)
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-07-01 22:45:43 +02:00
compat compat: remove in-tree NVidia headers 2018-02-27 16:22:12 +01:00
doc Update for FFmpeg 4.1.5 2020-01-06 16:38:20 +01:00
ffbuild Merge commit '17b6c7efb4' 2017-11-12 01:02:02 -03:00
fftools fftools/ffmpeg: Free swresample dictionary during cleanup 2020-07-01 22:33:24 +02:00
libavcodec avcodec/jpeg2000dwt: Fix undefined shifts of negative numbers 2020-07-01 22:30:42 +02:00
libavdevice Bump minor versions for branching 4.1 2018-11-02 00:15:32 +01:00
libavfilter avfilter/vf_xbr: Fix left shift of negative number 2020-07-01 22:31:20 +02:00
libavformat avformat/matroskadec: Fix use-after-free when demuxing ProRes 2020-07-01 22:45:43 +02:00
libavresample avresample: remove deprecated attribute from the AVAudioResampleContext struct 2018-01-09 10:56:53 -03:00
libavutil avutil/encryption_info: Don't pass NULL to memcpy 2020-07-01 22:25:36 +02:00
libpostproc postproc/postprocess_template: remove FF_REG_sp from clobber list 2019-01-21 07:53:26 +01:00
libswresample Bump minor versions for branching 4.1 2018-11-02 00:15:32 +01:00
libswscale swscale/utils: Fix invalid left shifts of negative numbers 2020-07-01 22:29:20 +02:00
presets presets: remove moldering iPod presets 2014-06-17 16:15:04 -08:00
tests avcodec/fitsdec: Use lrint() 2020-01-06 15:03:15 +01:00
tools tools/target_dec_fuzzer: Free parser in case of avcodec_open2() failure 2020-01-06 11:30:42 +01:00
.gitattributes fate: add SCC test 2017-01-27 17:06:42 +01:00
.gitignore Remove the ffserver program 2018-01-06 18:31:37 +00:00
.travis.yml Merge commit '4809781586' 2017-10-28 15:08:31 -03:00
Changelog Update for FFmpeg 4.1.5 2020-01-06 16:38:20 +01:00
configure configure: bump year 2020-01-06 15:03:15 +01:00
CONTRIBUTING.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL.md
LICENSE.md Merge commit '4fef648d10' 2017-03-15 22:07:47 +01:00
MAINTAINERS MAINTAINERS: remove myself as hls demuxer maintainer 2018-10-16 01:18:00 +03:00
Makefile avcodec/parser: move parsers list and related API to its own file 2018-07-21 16:08:29 -03:00
README.md Remove the ffserver program 2018-01-06 18:31:37 +00:00
RELEASE Update for FFmpeg 4.1.5 2020-01-06 16:38:20 +01:00
RELEASE_NOTES RELEASE_NOTES: Based on the version from 4.0 2018-11-02 01:36:21 +01:00

README.md

FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

  • libavcodec provides implementation of a wider range of codecs.
  • libavformat implements streaming protocols, container formats and basic I/O access.
  • libavutil includes hashers, decompressors and miscellaneous utility functions.
  • libavfilter provides a mean to alter decoded Audio and Video through chain of filters.
  • libavdevice provides an abstraction to access capture and playback devices.
  • libswresample implements audio mixing and resampling routines.
  • libswscale implements color conversion and scaling routines.

Tools

  • ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
  • ffplay is a minimalistic multimedia player.
  • ffprobe is a simple analysis tool to inspect multimedia content.
  • Additional small tools such as aviocat, ismindex and qt-faststart.

Documentation

The offline documentation is available in the doc/ directory.

The online documentation is available in the main website and in the wiki.

Examples

Coding examples are available in the doc/examples directory.

License

FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.

Contributing

Patches should be submitted to the ffmpeg-devel mailing list using git format-patch or git send-email. Github pull requests should be avoided because they are not part of our review process and will be ignored.