From 94cb3b6e0e8574d33813abd9ec1d8408f91996a6 Mon Sep 17 00:00:00 2001
From: Marek Kotewicz <marek.kotewicz@gmail.com>
Date: Wed, 27 Feb 2019 10:08:04 +0100
Subject: [PATCH] fix underflow in pip, closes #10419 (#10423)

---
 ethcore/light/src/net/mod.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ethcore/light/src/net/mod.rs b/ethcore/light/src/net/mod.rs
index cffbb0e96..2fd6c340e 100644
--- a/ethcore/light/src/net/mod.rs
+++ b/ethcore/light/src/net/mod.rs
@@ -533,6 +533,9 @@ impl LightProtocol {
 			// the timer approach will skip 1 (possibly 2) in rare occasions.
 			if peer_info.sent_head == announcement.head_hash ||
 				peer_info.status.head_num >= announcement.head_num ||
+				// fix for underflow reported in
+				// https://github.com/paritytech/parity-ethereum/issues/10419
+				now < peer_info.last_update ||
 				now - peer_info.last_update < UPDATE_INTERVAL {
 				continue
 			}