diff --git a/libavcodec/vmnc.c b/libavcodec/vmnc.c
index 30b1414e49..e273043311 100644
--- a/libavcodec/vmnc.c
+++ b/libavcodec/vmnc.c
@@ -333,11 +333,15 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     uint8_t *outptr;
     int dx, dy, w, h, depth, enc, chunks, res, size_left, ret;
 
+    bytestream2_init(gb, buf, buf_size);
+    bytestream2_skip(gb, 2);
+    chunks = bytestream2_get_be16(gb);
+    if (12LL * chunks > bytestream2_get_bytes_left(gb))
+        return AVERROR_INVALIDDATA;
+
     if ((ret = ff_reget_buffer(avctx, c->pic)) < 0)
         return ret;
 
-    bytestream2_init(gb, buf, buf_size);
-
     c->pic->key_frame = 0;
     c->pic->pict_type = AV_PICTURE_TYPE_P;
 
@@ -369,8 +373,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
             }
         }
     }
-    bytestream2_skip(gb, 2);
-    chunks = bytestream2_get_be16(gb);
+
     while (chunks--) {
         if (bytestream2_get_bytes_left(gb) < 12) {
             av_log(avctx, AV_LOG_ERROR, "Premature end of data!\n");