From cbad9a1fa59b2e945f6a8db9c801823326a5320d Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Thu, 4 Jun 2015 21:04:50 +0930
Subject: [PATCH] bitcoin_script: remember to push extra 0 for
 OP_CHECKMULTISIG.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 bitcoin_script.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/bitcoin_script.c b/bitcoin_script.c
index 5665a879e..8e8ac2057 100644
--- a/bitcoin_script.c
+++ b/bitcoin_script.c
@@ -279,6 +279,8 @@ u8 *scriptsig_p2sh_2of2(const tal_t *ctx,
 	u8 *script = tal_arr(ctx, u8, 0);
 	u8 *redeemscript;
 
+	/* OP_CHECKMULTISIG has an out-by-one bug, which MBZ */
+	add_number(&script, 0);
 	add_push_sig(&script, sig1);
 	add_push_sig(&script, sig2);