From: Matt Corallo <git@bluematt.me>
Date: Wed, 18 Jul 2018 17:36:00 +0000 (-0400)
Subject: Fix channelmonitor fuzz test failure
X-Git-Tag: v0.0.12~391^2
X-Git-Url: http://git.bitcoin.ninja/?a=commitdiff_plain;h=4f644f225c059e2731d848077adac11edb9cdcca;p=rust-lightning

Fix channelmonitor fuzz test failure
---

diff --git a/src/ln/channelmonitor.rs b/src/ln/channelmonitor.rs
index d212a3fdb..8c3fcc3f0 100644
--- a/src/ln/channelmonitor.rs
+++ b/src/ln/channelmonitor.rs
@@ -770,7 +770,14 @@ impl ChannelMonitor {
 			() => {
 				{
 					let tx_len = byte_utils::slice_to_be64(read_bytes!(8));
-					let tx: Transaction = unwrap_obj!(serialize::deserialize(read_bytes!(tx_len)));
+					let tx_ser = read_bytes!(tx_len);
+					let tx: Transaction = unwrap_obj!(serialize::deserialize(tx_ser));
+					if serialize::serialize(&tx).unwrap() != tx_ser {
+						// We check that the tx re-serializes to the same form to ensure there is
+						// no extra data, and as rust-bitcoin doesn't handle the 0-input ambiguity
+						// all that well.
+						return None;
+					}
 
 					let revocation_key = unwrap_obj!(PublicKey::from_slice(&secp_ctx, read_bytes!(33)));
 					let a_htlc_key = unwrap_obj!(PublicKey::from_slice(&secp_ctx, read_bytes!(33)));