diff --git a/libavcodec/speedhq.c b/libavcodec/speedhq.c
index a3b0bc4649..27aab11903 100644
--- a/libavcodec/speedhq.c
+++ b/libavcodec/speedhq.c
@@ -426,6 +426,8 @@ static int speedhq_decode_frame(AVCodecContext *avctx,
 
     if (buf_size < 4 || avctx->width < 8 || avctx->width % 8 != 0)
         return AVERROR_INVALIDDATA;
+    if (buf_size < avctx->width*avctx->height / 64 / 4)
+        return AVERROR_INVALIDDATA;
 
     quality = buf[0];
     if (quality >= 100) {