diff options
| -rw-r--r-- | libavformat/id3v2.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/libavformat/id3v2.c b/libavformat/id3v2.c index 9488fd856d..3891897bb3 100644 --- a/libavformat/id3v2.c +++ b/libavformat/id3v2.c @@ -561,8 +561,17 @@ static void ff_id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t unsync = flags & 0x80; - if (isv34 && flags & 0x40) /* Extended header present, just skip over it */ - avio_skip(s->pb, get_size(s->pb, 4)); + if (isv34 && flags & 0x40) { /* Extended header present, just skip over it */ + int extlen = get_size(s->pb, 4); + if (version == 4) + extlen -= 4; // in v2.4 the length includes the length field we just read + + if (extlen < 0) { + reason = "invalid extended header length"; + goto error; + } + avio_skip(s->pb, extlen); + } while (len >= taghdrlen) { unsigned int tflags = 0; |