GH-3826: Fix reducePermits

Must not go negative.
spring-projects · Jun 27, 2022 · 979b841 · 979b841
1 parent 6fe59a7
commit 979b841
Showing 1 changed file with 2 additions and 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
@@ -272,6 +272,7 @@ public synchronized void close() {
 		removeAllIdleItems();
 	}
 
+	@SuppressWarnings("serial")
 	private static class PoolSemaphore extends Semaphore {
 
 		PoolSemaphore(int permits) {
@@ -280,7 +281,7 @@ private static class PoolSemaphore extends Semaphore {
 
 		@Override
 		public void reducePermits(int reduction) { // NOSONAR increases visibility
-			super.reducePermits(reduction);
+			super.reducePermits(reduction > availablePermits() ? availablePermits() : reduction);
 		}
 
 	}