From ecb04bbb54336cf203b0b5f68ad0225b046c9588 Mon Sep 17 00:00:00 2001
From: Gary Russell <grussell@vmware.com>
Date: Mon, 27 Jun 2022 14:37:17 -0400
Subject: [PATCH] GH-3826: Fix reducePermits

Must not go negative.
---
 .../java/org/springframework/integration/util/SimplePool.java  | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/spring-integration-core/src/main/java/org/springframework/integration/util/SimplePool.java b/spring-integration-core/src/main/java/org/springframework/integration/util/SimplePool.java
index ce09905999..ff1b225ae6 100644
--- a/spring-integration-core/src/main/java/org/springframework/integration/util/SimplePool.java
+++ b/spring-integration-core/src/main/java/org/springframework/integration/util/SimplePool.java
@@ -272,6 +272,7 @@ public class SimplePool<T> implements Pool<T> {
 		removeAllIdleItems();
 	}
 
+	@SuppressWarnings("serial")
 	private static class PoolSemaphore extends Semaphore {
 
 		PoolSemaphore(int permits) {
@@ -280,7 +281,7 @@ public class SimplePool<T> implements Pool<T> {
 
 		@Override
 		public void reducePermits(int reduction) { // NOSONAR increases visibility
-			super.reducePermits(reduction);
+			super.reducePermits(reduction > availablePermits() ? availablePermits() : reduction);
 		}
 
 	}