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| author | Anton Khirnov <anton@khirnov.net> | 2012-03-31 07:52:42 +0200 |
|---|---|---|
| committer | Anton Khirnov <anton@khirnov.net> | 2012-04-01 19:20:50 +0200 |
| commit | bc5d86d23d1ad377addf54d65ee665327836075e (patch) | |
| tree | 1dc7cdff6224928401728860b30c3b34c95d595f | |
| parent | 1687c55e24cdc9d23401795e86928d3eb37a60f7 (diff) | |
| download | ffmpeg-bc5d86d23d1ad377addf54d65ee665327836075e.tar.gz | |
id3v2: fix skipping extended header in id3v2.4
In v2.4, the length includes the length field itself.
(cherry picked from commit ddb4431208745ea270dce8fce4cba999f0ed4303)
Signed-off-by: Anton Khirnov <anton@khirnov.net>
| -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 be6c03bbe5..326dd145ef 100644 --- a/libavformat/id3v2.c +++ b/libavformat/id3v2.c @@ -216,8 +216,17 @@ 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; |