undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.

test/jdk/java/io/LineNumberReader/MarkSplitCRLF.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2019, 2026, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/* @test
+ * @bug 8218280
+ * @summary Make sure marking a line feed within a CRLF sequence works correctly
+ * @run junit MarkSplitCRLF
+ */
+
+import java.io.IOException;
+import java.io.LineNumberReader;
+import java.io.Reader;
+import java.io.StringReader;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class MarkSplitCRLF {
+    @Test
+    public void testSpecifiedBufferSize() throws IOException {
+        final String string = "foo\r\nbar";
+        try (Reader reader =
+            new LineNumberReader(new StringReader(string), 5)) {
+            reader.read();  // 'f'
+            reader.read();  // 'o'
+            reader.read();  // 'o'
+            reader.read();  // '\r' -> '\n'
+            reader.mark(1); // mark position of '\n'
+            reader.read();  // 'b'
+            reader.reset(); // reset to '\n' position
+            assertEquals(reader.read(), 'b');
+            assertEquals(reader.read(), 'a');
+            assertEquals(reader.read(), 'r');
+        }
+    }
+
+    @Test
+    public void testCRNotFollowedByLF() throws IOException {
+        final String string = "foo\rbar";
+        try (Reader reader =
+            new LineNumberReader(new StringReader(string), 5)) {
+            reader.read();  // 'f'
+            reader.read();  // 'o'
+            reader.read();  // 'o'
+            reader.read();  // '\r'
+            reader.mark(1); // mark position of next character
+            reader.read();  // 'b'
+            reader.reset(); // reset to position after '\r'
+            assertEquals(reader.read(), 'b');
+            assertEquals(reader.read(), 'a');
+            assertEquals(reader.read(), 'r');
+        }
+    }
+
+    @Test
+    public void testDefaultBufferSize() throws IOException {
+        StringBuilder sb = new StringBuilder(8195);
+        for (int i = 0; i < 8190; i++) {
+            char c = (char)i;
+            sb.append(c);
+        }
+        sb.append('\r');
+        sb.append('\n');
+        sb.append('X');
+        sb.append('Y');
+        sb.append('Z');
+        final String string = sb.toString();
+        try (Reader reader = new LineNumberReader(new StringReader(string))) {
+            for (int i = 0; i < 8191; i++) reader.read();
+            reader.mark(1);
+            reader.read();
+            reader.reset();
+            assertEquals(reader.read(), 'X');
+            assertEquals(reader.read(), 'Y');
+            assertEquals(reader.read(), 'Z');
+        }
+    }
+}