From 78b56e34ffd03cbf944897fa905cc788ef076518 Mon Sep 17 00:00:00 2001
From: Keith Yeung <kungfukeith11@gmail.com>
Date: Tue, 10 Oct 2023 14:34:29 +0200
Subject: [PATCH] Use safe math when pruning statuses

---
 cumulus/pallets/xcmp-queue/src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cumulus/pallets/xcmp-queue/src/lib.rs b/cumulus/pallets/xcmp-queue/src/lib.rs
index 1cb92f595186..7ee07a7beb0a 100644
--- a/cumulus/pallets/xcmp-queue/src/lib.rs
+++ b/cumulus/pallets/xcmp-queue/src/lib.rs
@@ -1129,7 +1129,7 @@ impl<T: Config> XcmpMessageSource for Pallet<T> {
 		let pruned = old_statuses_len - statuses.len();
 		// removing an item from status implies a message being sent, so the result messages must
 		// be no less than the pruned channels.
-		statuses.rotate_left(result.len() - pruned);
+		statuses.rotate_left(result.len().saturating_sub(pruned));
 
 		<OutboundXcmpStatus<T>>::put(statuses);