reduce diff

Author: Dan Laine

x/merkledb/codec_test.go

@@ -5,7 +5,9 @@ package merkledb
 
 import (
 	"bytes"
+	"encoding/binary"
 	"io"
+	"math"
 	"math/rand"
 	"testing"
 
@@ -243,3 +245,10 @@ func FuzzEncodeHashValues(f *testing.F) {
 		},
 	)
 }
+
+func TestCodecDecodeKeyLengthOverflowRegression(t *testing.T) {
+	codec := codec.(*codecImpl)
+	bytes := bytes.NewReader(binary.AppendUvarint(nil, math.MaxInt))
+	_, err := codec.decodeKey(bytes)
+	require.ErrorIs(t, err, io.ErrUnexpectedEOF)
+}