From: Matt Corallo <git@bluematt.me>
Date: Wed, 1 Aug 2018 03:48:54 +0000 (-0400)
Subject: Fix panic!() in block_connected on unfunded channels (fixes #42)
X-Git-Tag: v0.0.12~354^2~6
X-Git-Url: http://git.bitcoin.ninja/?a=commitdiff_plain;h=cfc3fe3148b6d4bcf5b8b8eb974376a939e2edbb;p=rust-lightning

Fix panic!() in block_connected on unfunded channels (fixes #42)

The new full_stack_target fuzzing stuff was able to find this bug,
which gives me a bit of hope for full_stack_target's utility.
---

diff --git a/src/ln/channel.rs b/src/ln/channel.rs
index 188af477d..614c13b44 100644
--- a/src/ln/channel.rs
+++ b/src/ln/channel.rs
@@ -1827,6 +1827,7 @@ impl Channel {
 		self.user_id
 	}
 
+	/// May only be called after funding has been initiated (ie is_funding_initiated() is true)
 	pub fn channel_monitor(&self) -> ChannelMonitor {
 		if self.channel_state < ChannelState::FundingCreated as u32 {
 			panic!("Can't get a channel monitor until funding has been created");
@@ -1904,6 +1905,11 @@ impl Channel {
 		self.is_usable()
 	}
 
+	/// Returns true if funding_created was sent/received.
+	pub fn is_funding_initiated(&self) -> bool {
+		self.channel_state >= ChannelState::FundingCreated as u32
+	}
+
 	/// Returns true if this channel is fully shut down. True here implies that no further actions
 	/// may/will be taken on this channel, and thus this object should be freed. Any future changes
 	/// will be handled appropriately by the chain monitor.
diff --git a/src/ln/channelmanager.rs b/src/ln/channelmanager.rs
index f39d0c093..900b7c02b 100644
--- a/src/ln/channelmanager.rs
+++ b/src/ln/channelmanager.rs
@@ -1188,7 +1188,7 @@ impl ChainListener for ChannelManager {
 						}
 					}
 				}
-				if channel.channel_monitor().would_broadcast_at_height(height) {
+				if channel.is_funding_initiated() && channel.channel_monitor().would_broadcast_at_height(height) {
 					if let Some(short_id) = channel.get_short_channel_id() {
 						short_to_id.remove(&short_id);
 					}