From 248715067849162b72fe3f6c7136a663083aeda0 Mon Sep 17 00:00:00 2001
From: David Negrete <davidfn@amazon.com>
Date: Tue, 20 Dec 2022 07:42:59 -0700
Subject: [PATCH] Use synchronized block

---
 .../auth/credentials/ProfileCredentialsProvider.java   | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/core/auth/src/main/java/software/amazon/awssdk/auth/credentials/ProfileCredentialsProvider.java b/core/auth/src/main/java/software/amazon/awssdk/auth/credentials/ProfileCredentialsProvider.java
index b870b4f2b814..c2eb3424bf55 100644
--- a/core/auth/src/main/java/software/amazon/awssdk/auth/credentials/ProfileCredentialsProvider.java
+++ b/core/auth/src/main/java/software/amazon/awssdk/auth/credentials/ProfileCredentialsProvider.java
@@ -49,7 +49,7 @@ public final class ProfileCredentialsProvider
                SdkAutoCloseable,
                ToCopyableBuilder<ProfileCredentialsProvider.Builder, ProfileCredentialsProvider> {
 
-    private AwsCredentialsProvider credentialsProvider;
+    private volatile AwsCredentialsProvider credentialsProvider;
     private final RuntimeException loadException;
     private final Supplier<ProfileFile> profileFile;
     private volatile ProfileFile currentProfileFile;
@@ -118,8 +118,12 @@ public AwsCredentials resolveCredentials() {
 
         ProfileFile cachedOrRefreshedProfileFile = refreshProfileFile();
         if (isNewProfileFile(cachedOrRefreshedProfileFile)) {
-            currentProfileFile = cachedOrRefreshedProfileFile;
-            handleProfileFileReload(cachedOrRefreshedProfileFile);
+            synchronized (this) {
+                if (isNewProfileFile(cachedOrRefreshedProfileFile)) {
+                    currentProfileFile = cachedOrRefreshedProfileFile;
+                    handleProfileFileReload(cachedOrRefreshedProfileFile);
+                }
+            }
         }
 
         return credentialsProvider.resolveCredentials();