From 46b1e2739a2faa1f5bf72c6f12f2e1223525ad43 Mon Sep 17 00:00:00 2001
From: Guillaume Smet <guillaume.smet@gmail.com>
Date: Tue, 21 May 2024 17:01:49 +0200
Subject: [PATCH] Avoid StringIndexOutOfBoundsException in
 KafkaRuntimeConfigProducer

Fixes #40677
---
 .../kafka/client/runtime/KafkaRuntimeConfigProducer.java       | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/extensions/kafka-client/runtime/src/main/java/io/quarkus/kafka/client/runtime/KafkaRuntimeConfigProducer.java b/extensions/kafka-client/runtime/src/main/java/io/quarkus/kafka/client/runtime/KafkaRuntimeConfigProducer.java
index 504bc66168f4e..ba0f407ea5dec 100644
--- a/extensions/kafka-client/runtime/src/main/java/io/quarkus/kafka/client/runtime/KafkaRuntimeConfigProducer.java
+++ b/extensions/kafka-client/runtime/src/main/java/io/quarkus/kafka/client/runtime/KafkaRuntimeConfigProducer.java
@@ -35,6 +35,9 @@ public Map<String, Object> createKafkaRuntimeConfig(Config config, ApplicationCo
             if (!propertyNameLowerCase.startsWith(CONFIG_PREFIX) || propertyNameLowerCase.startsWith(UI_CONFIG_PREFIX)) {
                 continue;
             }
+            if (propertyNameLowerCase.length() <= CONFIG_PREFIX.length()) {
+                continue;
+            }
             // Replace _ by . - This is because Kafka properties tend to use . and env variables use _ for every special
             // character. So, replace _ with .
             String effectivePropertyName = propertyNameLowerCase.substring(CONFIG_PREFIX.length() + 1).toLowerCase()