Infinite loop during webservice request in io.helidon.http.http2.Http2Headers.DynamicTable#add helidon-io#10472

Signed-off-by: Jorge Bescos Gascon <[email protected]>

Author: jbescos

http/http2/src/main/java/io/helidon/http/http2/Http2Headers.java

@@ -1175,6 +1175,7 @@ void maxTableSize(long number) {
             }
             this.maxTableSize = number;
             if (maxTableSize == 0) {
+                currentTableSize = 0;
                 headers.clear();
             }
             while (maxTableSize < currentTableSize) {

http/http2/src/test/java/io/helidon/http/http2/DynamicTableTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022, 2023 Oracle and/or its affiliates.
+ * Copyright (c) 2022, 2025 Oracle and/or its affiliates.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -54,6 +54,19 @@ void testDynamicTable() {
         testRecord(table, Http2Headers.StaticHeader.MAX_INDEX + 2, "b", "c");
     }
 
+    @Test
+    void testIssue10472() {
+        Http2Settings settings = Http2Settings.builder()
+                .add(Http2Setting.HEADER_TABLE_SIZE, 35L)
+                .build();
+
+        Http2Headers.DynamicTable table = Http2Headers.DynamicTable.create(settings);
+        table.add(HeaderNames.create("a"), "aa"); // 35
+        testRecord(table, Http2Headers.StaticHeader.MAX_INDEX + 1, "a", "aa");
+        // This triggers the infinite loop
+        table.maxTableSize(0L);
+    }
+
     private void testRecord(Http2Headers.DynamicTable table,
                             int index,
                             String expectedName,