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swfdec: check lens validity

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-12-10 17:20:32 +01:00
parent a354839bfa
commit c73685398d
1 changed files with 4 additions and 0 deletions
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4
libavformat/swfdec.c
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@ -155,6 +155,10 @@ static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
tag = get_swf_tag(pb, &len); tag = get_swf_tag(pb, &len);
if (tag < 0) if (tag < 0)
return tag; return tag;
if (len < 0) {
av_log(s, AV_LOG_ERROR, "len %d is invalid\n", len);
return AVERROR_INVALIDDATA;
}
if (tag == TAG_VIDEOSTREAM) { if (tag == TAG_VIDEOSTREAM) {
int ch_id = avio_rl16(pb); int ch_id = avio_rl16(pb);
len -= 2; len -= 2;