From 97cb0308546cb59014f5357c627de16648a15b93 Mon Sep 17 00:00:00 2001
From: Conner Fromknecht <conner@lightning.engineering>
Date: Wed, 25 Nov 2020 15:04:57 -0800
Subject: [PATCH] wtclient: error on unknown witness type for backup task

---
 watchtower/wtclient/backup_task.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/watchtower/wtclient/backup_task.go b/watchtower/wtclient/backup_task.go
index 5f4385d7..6801d12b 100644
--- a/watchtower/wtclient/backup_task.go
+++ b/watchtower/wtclient/backup_task.go
@@ -1,6 +1,8 @@
 package wtclient
 
 import (
+	"fmt"
+
 	"github.com/btcsuite/btcd/blockchain"
 	"github.com/btcsuite/btcd/btcec"
 	"github.com/btcsuite/btcd/txscript"
@@ -293,6 +295,9 @@ func (t *backupTask) craftSessionPayload(
 			fallthrough
 		case input.CommitmentNoDelay:
 			copy(justiceKit.CommitToRemoteSig[:], signature[:])
+		default:
+			return hint, nil, fmt.Errorf("invalid witness type: %v",
+				inp.WitnessType())
 		}
 	}