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tm2dec: check total_frames and extradata_size. 

Fixes overread

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-03-28 08:05:11 +02:00
parent b17b296369
commit 936951ca5c
1 changed files with 4 additions and 1 deletions
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5
libavcodec/tta.c
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@ -251,11 +251,14 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
av_log(s->avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",
s->data_length, s->frame_length, s->last_frame_length, s->total_frames);
if (s->total_frames < 0)
return AVERROR_INVALIDDATA;
// FIXME: seek table
if (get_bits_left(&s->gb) < 32 * s->total_frames + 32)
av_log(avctx, AV_LOG_WARNING, "Seek table missing or too small\n");
else if (avctx->err_recognition & AV_EF_CRCCHECK) {
if (tta_check_crc(s, avctx->extradata + 22, s->total_frames * 4))
if (avctx->extradata_size < 26 + s->total_frames * 4 || tta_check_crc(s, avctx->extradata + 22, s->total_frames * 4))
return AVERROR_INVALIDDATA;
}
skip_bits_long(&s->gb, 32 * s->total_frames);