avcodec/utvideodec: Set pro flag based on fourcc

This avoids mixing 8bit variants with pro and 10bit with non pro mode.
Fixes: out of array read
Fixes: poc_03_30.avi

Found-by: GwanYeong Kim <gy741.kim@gmail.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/utvideodec.c

@@ -949,14 +949,17 @@ static av_cold int decode_init(AVCodecContext *avctx)
         break;
     case MKTAG('U', 'Q', 'Y', '2'):
         c->planes      = 3;
+        c->pro         = 1;
         avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
         break;
     case MKTAG('U', 'Q', 'R', 'G'):
         c->planes      = 3;
+        c->pro         = 1;
         avctx->pix_fmt = AV_PIX_FMT_GBRP10;
         break;
     case MKTAG('U', 'Q', 'R', 'A'):
         c->planes      = 4;
+        c->pro         = 1;
         avctx->pix_fmt = AV_PIX_FMT_GBRAP10;
         break;
     case MKTAG('U', 'L', 'H', '0'):
@@ -1031,7 +1034,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
         if (c->compression != 2)
             avpriv_request_sample(avctx, "Unknown compression type");
         c->slices      = avctx->extradata[9] + 1;
-    } else if (avctx->extradata_size >= 16) {
+    } else if (!c->pro && avctx->extradata_size >= 16) {
         av_log(avctx, AV_LOG_DEBUG, "Encoder version %d.%d.%d.%d\n",
                avctx->extradata[3], avctx->extradata[2],
                avctx->extradata[1], avctx->extradata[0]);
@@ -1046,14 +1049,13 @@ static av_cold int decode_init(AVCodecContext *avctx)
         c->slices      = (c->flags >> 24) + 1;
         c->compression = c->flags & 1;
         c->interlaced  = c->flags & 0x800;
-    } else if (avctx->extradata_size == 8) {
+    } else if (c->pro && avctx->extradata_size == 8) {
         av_log(avctx, AV_LOG_DEBUG, "Encoder version %d.%d.%d.%d\n",
                avctx->extradata[3], avctx->extradata[2],
                avctx->extradata[1], avctx->extradata[0]);
         av_log(avctx, AV_LOG_DEBUG, "Original format %"PRIX32"\n",
                AV_RB32(avctx->extradata + 4));
         c->interlaced  = 0;
-        c->pro         = 1;
         c->frame_info_size = 4;
     } else {
         av_log(avctx, AV_LOG_ERROR,