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jpeg2000: Check that there is a SOT before SOD

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Avoid overreads.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Michael Niedermayer 2013-07-01 10:01:14 +02:00 committed by Luca Barbato
parent 2c3901b2c3
commit b564784a20
1 changed files with 16 additions and 0 deletions
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16
libavcodec/jpeg2000dec.c
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@ -1236,6 +1236,22 @@ static int jpeg2000_read_main_headers(Jpeg2000DecoderContext *s)
marker = bytestream2_get_be16u(&s->g);
oldpos = bytestream2_tell(&s->g);
if (marker == JPEG2000_SOD) {
Jpeg2000Tile *tile;
Jpeg2000TilePart *tp;
if (s->curtileno < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Missing SOT\n");
return AVERROR_INVALIDDATA;
}
tile = s->tile + s->curtileno;
tp = tile->tile_part + tile->tp_idx;
bytestream2_init(&tp->tpg, s->g.buffer, tp->tp_end - s->g.buffer);
bytestream2_skip(&s->g, tp->tp_end - s->g.buffer);
continue;
}
if (marker == JPEG2000_EOC)
break;