diff --git a/libavcodec/vima.c b/libavcodec/vima.c
index 30051985c0..648ae55016 100644
--- a/libavcodec/vima.c
+++ b/libavcodec/vima.c
@@ -141,11 +141,11 @@ static int decode_frame(AVCodecContext *avctx, void *data,
     int8_t         channel_hint[2];
     int            ret, chan, channels = 1;
 
-    init_get_bits(&gb, pkt->data, pkt->size * 8);
-
     if (pkt->size < 13)
         return AVERROR_INVALIDDATA;
 
+    init_get_bits(&gb, pkt->data, pkt->size * 8);
+
     samples = get_bits_long(&gb, 32);
     if (samples == 0xffffffff) {
         skip_bits_long(&gb, 32);