From: Jeffrey Czyz <jkczyz@gmail.com>
Date: Wed, 27 Oct 2021 19:30:15 +0000 (-0500)
Subject: f - Fix divide by zero
X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=commitdiff_plain;h=07cd143e58de201ab3536276c28fcfc29aab41e0;p=rust-lightning

f - Fix divide by zero
---

diff --git a/lightning/src/routing/scorer.rs b/lightning/src/routing/scorer.rs
index 6e3b2a289..568be52df 100644
--- a/lightning/src/routing/scorer.rs
+++ b/lightning/src/routing/scorer.rs
@@ -170,8 +170,12 @@ impl routing::Score for Scorer {
 
 #[cfg(not(feature = "no-std"))]
 fn decay_from(penalty_msat: u64, last_failure: &SystemTime, half_life: Duration) -> u64 {
-	let decays = last_failure.elapsed().ok().map_or(0, |elapsed| {
-		elapsed.as_secs() / half_life.as_secs()
-	});
-	penalty_msat >> decays
+	let decays = match last_failure.elapsed().ok() {
+		Some(elapsed) => elapsed.as_secs().checked_div(half_life.as_secs()),
+		None => Some(0),
+	};
+	match decays {
+		Some(decays) => penalty_msat >> decays,
+		None => 0,
+	}
 }