libid3tag: id3_utf16_deserialize() misparses ID3v2 tags with an odd number of bytes resulting in an endless loop

id3_utf16_deserialize() in utf16.c in libid3tag through 0.15.1b misparses ID3v2 tags encoded in UTF-16 with an odd number of bytes, triggering an endless loop allocating memory until an OOM condition is reached, leading to denial-of-service (DoS).