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dfa33bec08
With specially crafted WAV files having the "id3 " chunk as the only valid chunk, when trying to write the tags, the existing "id3 " chunk is removed, and then vector::front() is called on the now empty chunks vector. Now it is checked if the vector is empty to avoid the crash.
TagLib
TagLib Audio Metadata Library
TagLib is a library for reading and editing the metadata of several popular audio formats. Currently, it supports both ID3v1 and ID3v2 for MP3 files, Ogg Vorbis comments and ID3 tags in FLAC, MPC, Speex, WavPack, TrueAudio, WAV, AIFF, MP4, APE, and ASF files.
TagLib is distributed under the GNU Lesser General Public License (LGPL) and Mozilla Public License (MPL). Essentially that means that it may be used in proprietary applications, but if changes are made to TagLib they must be contributed back to the project. Please review the licenses if you are considering using TagLib in your project.