Fix IAST VerifyError on custom StreamReader with super call

dd-java-agent/instrumentation/java-io/src/test/groovy/datadog/trace/instrumentation/java/io/InputStreamReaderCallSiteTest.groovy

@@ -2,6 +2,7 @@ package datadog.trace.instrumentation.java.io
 
 import datadog.trace.api.iast.InstrumentationBridge
 import datadog.trace.api.iast.propagation.PropagationModule
+import foo.bar.TestCustomInputStreamReader
 import foo.bar.TestInputStreamReaderSuite
 
 import java.nio.charset.Charset
@@ -27,4 +28,21 @@ class InputStreamReaderCallSiteTest extends  BaseIoCallSiteTest{
       [new ByteArrayInputStream("test".getBytes())]// Reader input
     ]
   }
+
+  void 'test InputStreamReader.<init> with super call and parameter'(){
+    // XXX: Do not modify the constructor call here. Regression test for APPSEC-58131.
+    given:
+    PropagationModule iastModule = Mock(PropagationModule)
+    InstrumentationBridge.registerIastModule(iastModule)
+
+    when:
+    new TestCustomInputStreamReader(*args)
+
+    then:
+    1 * iastModule.taintObjectIfTainted(_ as InputStreamReader, _ as InputStream)
+    0 * _
+
+    where:
+    args << [[new ByteArrayInputStream("test".getBytes()), Charset.defaultCharset()],]
+  }
 }

dd-java-agent/instrumentation/java-io/src/test/java/foo/bar/TestCustomInputStreamReader.java

@@ -0,0 +1,26 @@
+package foo.bar;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.nio.charset.Charset;
+
+public class TestCustomInputStreamReader extends InputStreamReader {
+
+  public TestCustomInputStreamReader(final InputStream in) throws IOException {
+    super(in);
+  }
+
+  public TestCustomInputStreamReader(final InputStream in, final Charset charset)
+      throws IOException {
+    // XXX: DO NOT MODIFY THIS CODE. This is testing a very specific error (APPSEC-58131).
+    // This caused the following error:
+    //   VerifyError: Inconsistent stackmap frames at branch target \d
+    //   Reason: urrent frame's stack size doesn't match stackmap.
+    // To trigger this, it is necessary to consume an argument after the super call.
+    super(in, charset);
+    if (charset != null) {
+      System.out.println("Using charset: " + charset.name());
+    }
+  }
+}