From 23a6a6dc70e8acc94c9326079880cd9bf00ad033 Mon Sep 17 00:00:00 2001
From: Flavia Rainone <frainone@redhat.com>
Date: Tue, 26 Sep 2023 03:18:58 -0300
Subject: [PATCH] [UNDERTOW-2304] Prevent repeating SslConduit.doUnwrap under
 task thread exhaustion conditions

Signed-off-by: Flavia Rainone <frainone@redhat.com>
---
 .../src/main/java/io/undertow/protocols/ssl/SslConduit.java | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/core/src/main/java/io/undertow/protocols/ssl/SslConduit.java b/core/src/main/java/io/undertow/protocols/ssl/SslConduit.java
index c627256c01..398831608d 100644
--- a/core/src/main/java/io/undertow/protocols/ssl/SslConduit.java
+++ b/core/src/main/java/io/undertow/protocols/ssl/SslConduit.java
@@ -122,6 +122,7 @@ public class SslConduit implements StreamSourceConduit, StreamSinkConduit {
     private static final int FLAG_CLOSED = 1 << 12;
     private static final int FLAG_WRITE_CLOSED = 1 << 13;
     private static final int FLAG_READ_CLOSED = 1 << 14;
+
     public static final ByteBuffer EMPTY_BUFFER = ByteBuffer.allocate(0);
 
     /**
@@ -1142,14 +1143,13 @@ public void run() {
                             task.run();
                         } finally {
                             synchronized (SslConduit.this) {
-                                if (outstandingTasks == 1) {
+                                if (outstandingTasks-- == 1) {
                                     getWriteThread().execute(new Runnable() {
                                         @Override
                                         public void run() {
                                             synchronized (SslConduit.this) {
                                                 SslConduit.this.notifyAll();
 
-                                                --outstandingTasks;
                                                 try {
                                                     doHandshake();
                                                 } catch (IOException | RuntimeException | Error e) {
@@ -1165,8 +1165,6 @@ public void run() {
                                             }
                                         }
                                     });
-                                } else {
-                                    outstandingTasks--;
                                 }
                             }
                         }