nuv: validate image size

Avoid a division by zero.

CC: libav-stable@libav.org
Bug-Id: CID 717750

libavformat/nuv.c

@@ -20,6 +20,7 @@
  */
 
 #include "libavutil/channel_layout.h"
+#include "libavutil/imgutils.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/intfloat.h"
 #include "avformat.h"
@@ -188,6 +189,10 @@ static int nuv_header(AVFormatContext *s)
             return AVERROR(ENOMEM);
         ctx->v_id = vst->index;
 
+        ret = av_image_check_size(width, height, 0, ctx);
+        if (ret < 0)
+            return ret;
+
         vst->codec->codec_type            = AVMEDIA_TYPE_VIDEO;
         vst->codec->codec_id              = AV_CODEC_ID_NUV;
         vst->codec->width                 = width;