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vc1dec: Don't decode slices when the latest slice header failed to decode 

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Michael Niedermayer 2013-02-19 21:40:09 +01:00 committed by Martin Storsjö
parent 5e25fdbfe0
commit bb7bf17595
1 changed files with 6 additions and 2 deletions
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8
libavcodec/vc1dec.c
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@ -5972,6 +5972,8 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
if (avctx->hwaccel->end_frame(avctx) < 0)
goto err;
} else {
int header_ret = 0;
ff_mpeg_er_frame_start(s);
v->bits = buf_size * 8;
@ -6009,18 +6011,20 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
if (i) {
v->pic_header_flag = 0;
if (v->field_mode && i == n_slices1 + 2) {
if (ff_vc1_parse_frame_header_adv(v, &s->gb) < 0) {
if ((header_ret = ff_vc1_parse_frame_header_adv(v, &s->gb)) < 0) {
av_log(v->s.avctx, AV_LOG_ERROR, "Field header damaged\n");
continue;
}
} else if (get_bits1(&s->gb)) {
v->pic_header_flag = 1;
if (ff_vc1_parse_frame_header_adv(v, &s->gb) < 0) {
if ((header_ret = ff_vc1_parse_frame_header_adv(v, &s->gb)) < 0) {
av_log(v->s.avctx, AV_LOG_ERROR, "Slice header damaged\n");
continue;
}
}
}
if (header_ret < 0)
continue;
s->start_mb_y = (i == 0) ? 0 : FFMAX(0, slices[i-1].mby_start % mb_height);
if (!v->field_mode || v->second_field)
s->end_mb_y = (i == n_slices ) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);