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vc1: skip motion compensation when data for last picture is invalid 

Bug-Id: 1101
Cc: libav-stable@libav.org
This commit is contained in:
Sean McGovern 2018-01-27 21:19:30 -05:00
parent 6829a07944
commit 5085f25ace
1 changed files with 5 additions and 0 deletions
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5
libavcodec/vc1_mc.c
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@ -689,6 +689,11 @@ void ff_vc1_mc_4mv_chroma4(VC1Context *v, int dir, int dir2, int avg)
if (s->avctx->flags & AV_CODEC_FLAG_GRAY)
return;
if (!s->last_picture.f->data[1]) {
av_log(s->avctx, AV_LOG_ERROR, "Bad data in last picture frame.\n");
return;
}
for (i = 0; i < 4; i++) {
int d = i < 2 ? dir: dir2;
tx = s->mv[d][i][0];