vc1dec: check that coded slice positions and interlacing match.

This fixes out of array writes.

Addresses: CVE-2012-2796

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>
(cherry picked from commit 1100acbab2)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>

libavcodec/vc1dec.c

@@ -5710,6 +5710,12 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
         mb_height = s->mb_height >> v->field_mode;
         for (i = 0; i <= n_slices; i++) {
             if (i > 0 &&  slices[i - 1].mby_start >= mb_height) {
+                if (v->field_mode <= 0) {
+                    av_log(v->s.avctx, AV_LOG_ERROR, "Slice %d starts beyond "
+                           "picture boundary (%d >= %d)\n", i,
+                           slices[i - 1].mby_start, mb_height);
+                    continue;
+                }
                 v->second_field = 1;
                 v->blocks_off   = s->mb_width  * s->mb_height << 1;
                 v->mb_off       = s->mb_stride * s->mb_height >> 1;