diff --git a/modules/git/blob.go b/modules/git/blob.go
index 020a591a23..a093dee205 100644
--- a/modules/git/blob.go
+++ b/modules/git/blob.go
@@ -83,13 +83,14 @@ func (b *Blob) DataAsync() (io.ReadCloser, error) {
 	}
 
 	if size < 4096 {
-		bs, err := io.ReadAll(io.LimitReader(rd, size))
+		buf := make([]byte, size)
+		_, err := io.ReadFull(rd, buf)
 		defer cancel()
 		if err != nil {
 			return nil, err
 		}
 		_, err = rd.Discard(1)
-		return io.NopCloser(bytes.NewReader(bs)), err
+		return io.NopCloser(bytes.NewReader(buf)), err
 	}
 
 	return &blobReader{
diff --git a/modules/git/blob_test.go b/modules/git/blob_test.go
index 7caa2d2de3..96190aaf24 100644
--- a/modules/git/blob_test.go
+++ b/modules/git/blob_test.go
@@ -143,7 +143,7 @@ func Benchmark_Blob_Data(b *testing.B) {
 		b.Fatal(err)
 	}
 
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		r, err := testBlob.DataAsync()
 		if err != nil {
 			b.Fatal(err)