lidavidm commented on code in PR #1422:
URL: https://github.com/apache/arrow-java/pull/1422#discussion_r4434217902
##########
vector/src/main/java/org/apache/arrow/vector/ipc/message/ArrowFieldNode.java:
##########
@@ -35,6 +36,13 @@ public class ArrowFieldNode implements FBSerializable {
*/
public ArrowFieldNode(long length, long nullCount) {
super();
+ // A negative length is never valid and, if accepted, flows unchecked into
buffer size
+ // computations (BitVectorHelper.getValidityBufferSizeFromCount performs
an unsigned shift)
+ // and into ArrowBuf.setOne/setZero, which can corrupt memory when bounds
checking is
+ // disabled. Reject it at this single chokepoint shared by every
deserialization path
+ // (IPC, JSON, C Data). nullCount is intentionally not checked here:
VectorUnloader uses -1
+ // as a sentinel meaning "null count not included".
Review Comment:
I don't know if this comment really helps; at the very least it should be
significantly trimmed. Also we could validate nullCount >= -1 at least?
##########
vector/src/test/java/org/apache/arrow/vector/ipc/message/TestArrowFieldNode.java:
##########
@@ -0,0 +1,55 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.arrow.vector.ipc.message;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.junit.jupiter.api.Test;
+
+public class TestArrowFieldNode {
+
+ @Test
+ public void testNegativeLengthRejected() {
+ // A negative length that still fits in an int must be rejected. Left
unchecked it flows into
+ // BitVectorHelper.getValidityBufferSizeFromCount (unsigned shift ->
~512MB) and into
+ // ArrowBuf.setOne(0, length / 8) with a negative length, corrupting
memory when bounds
+ // checking is disabled. See the deserialization paths in
MessageSerializer and JsonFileReader.
Review Comment:
Same here.
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