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Andreas Rheinhardt 25a5fddbb7 avformat/apngdec: Fix size/overflow checks 
apng data consists of parts containing a small header (including a
four-byte size field) and a data part; the size field does not account
for everything and is actually twelve bytes short of the actual size. In
order to make sure that the size fits into an int, the size field is
checked for being > INT_MAX; yet this does not account for the + 12 and
upon conversion to int (which happens when calling append_extradata()),
the size parameter can still wrap around. In this case the currently
used check would lead to undefined signed integer overflow.

Furthermore, append_extradata() appends the new data to the already
existing extradata and therefore needs to make sure that the combined
size of new and old data as well as padding fits into an int. The check
used for this is "if (old_size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE -
new_size)". If new_size is > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE
the right side becomes negative if the types are signed (as they are
now); yet changing this to "if (new_size > INT_MAX -
AV_INPUT_BUFFER_PADDING_SIZE - old_size)" is better as this also works
for unsigned types (where it is of course presumed that INT_MAX is
replaced by the corresponding maximum for the new type).

Both of these issues have been fixed.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
(cherry picked from commit 9c341c6c92)
2021-02-27 07:20:59 +01:00
compat
doc
ffbuild
fftools
libavcodec avcodec/bitstream: Consistently treat symbol as VLC_TYPE 2021-02-27 07:20:58 +01:00
libavdevice
libavfilter avfilter/vf_minterpolate: Fix left shift of negative value 2021-02-27 07:20:58 +01:00
libavformat avformat/apngdec: Fix size/overflow checks 2021-02-27 07:20:59 +01:00
libavresample
libavutil
libpostproc
libswresample swresample/audioconvert: Fix left shift of negative value 2021-02-27 07:20:58 +01:00
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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.