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id3v2: don't discard the whole tag when encountering empty frames.

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While they're technically invalid, it's better to skip them and try to
read the rest of the tag.
This commit is contained in:
Anton Khirnov 2011-10-02 07:16:09 +02:00
parent 24ec9ac475
commit 1e18d32d01
1 changed files with 7 additions and 1 deletions
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8
libavformat/id3v2.c
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@ -401,13 +401,19 @@ static void ff_id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t
tag[3] = 0;
tlen = avio_rb24(s->pb);
}
if (tlen <= 0 || tlen > len - taghdrlen) {
if (tlen < 0 || tlen > len - taghdrlen) {
av_log(s, AV_LOG_WARNING, "Invalid size in frame %s, skipping the rest of tag.\n", tag);
break;
}
len -= taghdrlen + tlen;
next = avio_tell(s->pb) + tlen;
if (!tlen) {
if (tag[0])
av_log(s, AV_LOG_DEBUG, "Invalid empty frame %s, skipping.\n", tag);
continue;
}
if (tflags & ID3v2_FLAG_DATALEN) {
avio_rb32(s->pb);
tlen -= 4;