2 files changed, 15 insertions, 13 deletions
diff --git a/libgo/go/encoding/base64/base64.go b/libgo/go/encoding/base64/base64.go
index 690d3ce..0c33f8e 100644
--- a/libgo/go/encoding/base64/base64.go
+++ b/libgo/go/encoding/base64/base64.go
@@ -480,15 +480,16 @@ func (enc *Encoding) Decode(dst, src []byte) (n int, err error) {
 
 	si := 0
 	for strconv.IntSize >= 64 && len(src)-si >= 8 && len(dst)-n >= 8 {
+		src2 := src[si : si+8]
 		if dn, ok := assemble64(
-			enc.decodeMap[src[si+0]],
-			enc.decodeMap[src[si+1]],
-			enc.decodeMap[src[si+2]],
-			enc.decodeMap[src[si+3]],
-			enc.decodeMap[src[si+4]],
-			enc.decodeMap[src[si+5]],
-			enc.decodeMap[src[si+6]],
-			enc.decodeMap[src[si+7]],
+			enc.decodeMap[src2[0]],
+			enc.decodeMap[src2[1]],
+			enc.decodeMap[src2[2]],
+			enc.decodeMap[src2[3]],
+			enc.decodeMap[src2[4]],
+			enc.decodeMap[src2[5]],
+			enc.decodeMap[src2[6]],
+			enc.decodeMap[src2[7]],
 		); ok {
 			binary.BigEndian.PutUint64(dst[n:], dn)
 			n += 6
@@ -504,11 +505,12 @@ func (enc *Encoding) Decode(dst, src []byte) (n int, err error) {
 	}
 
 	for len(src)-si >= 4 && len(dst)-n >= 4 {
+		src2 := src[si : si+4]
 		if dn, ok := assemble32(
-			enc.decodeMap[src[si+0]],
-			enc.decodeMap[src[si+1]],
-			enc.decodeMap[src[si+2]],
-			enc.decodeMap[src[si+3]],
+			enc.decodeMap[src2[0]],
+			enc.decodeMap[src2[1]],
+			enc.decodeMap[src2[2]],
+			enc.decodeMap[src2[3]],
 		); ok {
 			binary.BigEndian.PutUint32(dst[n:], dn)
 			n += 3
diff --git a/libgo/go/encoding/base64/base64_test.go b/libgo/go/encoding/base64/base64_test.go
index bc67036..c2c9478 100644
--- a/libgo/go/encoding/base64/base64_test.go
+++ b/libgo/go/encoding/base64/base64_test.go
@@ -401,7 +401,7 @@ func TestDecoderIssue3577(t *testing.T) {
 		source: "VHdhcyBicmlsbGlnLCBhbmQgdGhlIHNsaXRoeSB0b3Zlcw==", // twas brillig...
 		nextc:  next,
 	})
-	errc := make(chan error)
+	errc := make(chan error, 1)
 	go func() {
 		_, err := ioutil.ReadAll(d)
 		errc <- err