use safe String() for UserIdentity (#227) (#229)

pingcap · Mar 4, 2019 · 9f218bd · 9f218bd
1 parent c68bfe7
commit 9f218bd
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/auth/auth.go b/auth/auth.go
@@ -35,6 +35,9 @@ type UserIdentity struct {
 // String converts UserIdentity to the format user@host.
 func (user *UserIdentity) String() string {
 	// TODO: Escape username and hostname.
+	if user == nil {
+		return ""
+	}
 	return fmt.Sprintf("%s@%s", user.Username, user.Hostname)
 }