From 8248dccaeee911ea04f16fed6442fd82b7f600d8 Mon Sep 17 00:00:00 2001
From: ZmnSCPxj <ZmnSCPxj@protonmail.com>
Date: Wed, 31 Jan 2018 17:16:05 +0000
Subject: [PATCH] channeld: Properly pad and HMAC onion replies that our
 masterd generated.

---
 channeld/channel.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/channeld/channel.c b/channeld/channel.c
index 253cefcff..cb7fbc3c7 100644
--- a/channeld/channel.c
+++ b/channeld/channel.c
@@ -2332,10 +2332,16 @@ static void handle_fail(struct peer *peer, const u8 *inmsg)
 							failcode);
 		} else {
 			u8 *reply;
+			u8 *failmsg;
+
+			if (failcode) {
+				failmsg = make_failmsg(inmsg, peer, h,
+						       failcode, &scid);
+				errpkt = create_onionreply(inmsg,
+							   h->shared_secret,
+							   failmsg);
+			}
 
-			if (failcode)
-				errpkt = make_failmsg(inmsg, peer, h,
-						      failcode, &scid);
 			reply = wrap_onionreply(inmsg, h->shared_secret,
 						errpkt);
 			msg = towire_update_fail_htlc(peer, &peer->channel_id,