else
s->mcsel = 0;
cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
+ if (cbpy < 0) {
+ av_log(s->avctx, AV_LOG_ERROR,
+ "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
+ return AVERROR_INVALIDDATA;
+ }
cbp = (cbpc & 3) | (cbpy << 2);
if (dquant)