9475175ec0
The ASF file format has a limit of 127 streams and the "asf_o" demuxer (the ASF demuxer from Libav) has an array of pointers for a structure called ASFStream that is allocated on demand for every stream. Attached pictures are not streams in the sense of the ASF specification, yet the demuxer created an ASFStream for them; and in one codepath it also forgot to check whether the array of ASFStreams is already full. The result is a write beyond the end of the array and a segfault lateron. Fixing this is easy: Don't create ASFStreams for attached picture streams. (Other results of the current state of affairs are unnecessary allocations (of ASFStreams structures), the misparsing of valid files (there might not be enough ASFStreams left for the valid streams if attached pictures take up too many); furthermore, the ASFStreams created for attached pictures all have the stream number 0, an invalid stream number (the valid range is 1-127). This means that invalid data (packets for a stream with stream number 0) won't get rejected lateron.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> (cherry picked from commit e83f27a21a6d2f602b55e541ef66e365400e9827)
FFmpeg README
FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.
Libraries
libavcodecprovides implementation of a wider range of codecs.libavformatimplements streaming protocols, container formats and basic I/O access.libavutilincludes hashers, decompressors and miscellaneous utility functions.libavfilterprovides a mean to alter decoded Audio and Video through chain of filters.libavdeviceprovides an abstraction to access capture and playback devices.libswresampleimplements audio mixing and resampling routines.libswscaleimplements 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,ismindexandqt-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.