fix panic when Xor handles different length of input

Signed-off-by: lance6716 <[email protected]>

Author: lance6716

mysql/mysql_gtid.go

@@ -111,20 +111,6 @@ func (s IntervalSlice) Normalize() IntervalSlice {
 	return n
 }
 
-func min(a, b int64) int64 {
-	if a < b {
-		return a
-	}
-	return b
-}
-
-func max(a, b int64) int64 {
-	if a > b {
-		return a
-	}
-	return b
-}
-
 func (s *IntervalSlice) InsertInterval(interval Interval) {
 	var (
 		count int

mysql/util.go

@@ -56,9 +56,10 @@ func CalcNativePassword(scramble, password []byte) []byte {
 	return Xor(scrambleHash, stage1)
 }
 
-// Xor hash1 modified in-place with XOR against hash2
+// Xor modifies hash1 in-place with XOR against hash2
 func Xor(hash1 []byte, hash2 []byte) []byte {
-	for i := range hash1 {
+	l := min(len(hash1), len(hash2))
+	for i := range l {
 		hash1[i] ^= hash2[i]
 	}
 	return hash1