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jpeg2000dec: Check that theres a SOT before SOD

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Fixes out of array access

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-06-06 10:50:33 +02:00
parent c51654fbc0
commit b26bcd08e6
1 changed files with 9 additions and 2 deletions
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11
libavcodec/jpeg2000dec.c
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@ -1208,9 +1208,16 @@ static int jpeg2000_read_main_headers(Jpeg2000DecoderContext *s)
oldpos = bytestream2_tell(&s->g);
if (marker == JPEG2000_SOD) {
Jpeg2000Tile *tile = s->tile + s->curtileno;
Jpeg2000TilePart *tp = tile->tile_part + tile->tp_idx;
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);