Fix crash when input bad method in shadowsocks multi-user inbound

inbound/shadowsocks.go

@@ -70,7 +70,7 @@ func newShadowsocks(ctx context.Context, router adapter.Router, logger log.Conte
 	case common.Contains(shadowaead_2022.List, options.Method):
 		inbound.service, err = shadowaead_2022.NewServiceWithPassword(options.Method, options.Password, udpTimeout, inbound.upstreamContextHandler())
 	default:
-		err = E.New("shadowsocks: unsupported method: ", options.Method)
+		err = E.New("unsupported method: ", options.Method)
 	}
 	inbound.packetUpstream = inbound.service
 	return inbound, err

inbound/shadowsocks_multi.go

@@ -13,6 +13,7 @@ import (
 	"github.com/sagernet/sing/common"
 	"github.com/sagernet/sing/common/auth"
 	"github.com/sagernet/sing/common/buf"
+	E "github.com/sagernet/sing/common/exceptions"
 	F "github.com/sagernet/sing/common/format"
 	N "github.com/sagernet/sing/common/network"
 )
@@ -48,6 +49,9 @@ func newShadowsocksMulti(ctx context.Context, router adapter.Router, logger log.
 	} else {
 		udpTimeout = int64(C.UDPTimeout.Seconds())
 	}
+	if !common.Contains(shadowaead_2022.List, options.Method) {
+		return nil, E.New("unsupported method: " + options.Method)
+	}
 	service, err := shadowaead_2022.NewMultiServiceWithPassword[int](
 		options.Method,
 		options.Password,