HBASE-22032 KeyValue validation should check for null byte array

Signed-off-by: Andrew Purtell <apurtell@apache.org>

hbase-common/src/main/java/org/apache/hadoop/hbase/KeyValueUtil.java

@@ -509,11 +509,17 @@ public class KeyValueUtil {
   }
 
   static String bytesToHex(byte[] buf, int offset, int length) {
-    return ", KeyValueBytesHex=" + Bytes.toStringBinary(buf, offset, length) + ", offset=" + offset
+    String bufferContents = buf != null ? Bytes.toStringBinary(buf, offset, length) : "<null>";
+    return ", KeyValueBytesHex=" + bufferContents + ", offset=" + offset
         + ", length=" + length;
   }
 
   static void checkKeyValueBytes(byte[] buf, int offset, int length, boolean withTags) {
+    if (buf == null) {
+      throw new IllegalArgumentException("Invalid to have null " +
+          "byte array in KeyValue.");
+    }
+
     int pos = offset, endOffset = offset + length;
     // check the key
     if (pos + Bytes.SIZEOF_INT > endOffset) {

hbase-common/src/test/java/org/apache/hadoop/hbase/TestKeyValue.java

@@ -623,6 +623,20 @@ public class TestKeyValue {
     }
   }
 
+  @Test
+  public void testNullByteArrayKeyValueFailure() {
+    //can't add to testCheckKeyValueBytesFailureCase because it
+    //goes through the InputStream KeyValue API which can't produce a null buffer
+    try {
+      KeyValue kv = new KeyValue(null, 0, 0);
+    } catch (IllegalArgumentException iae){
+      assertEquals("Invalid to have null byte array in KeyValue.", iae.getMessage());
+      return;
+    }
+    fail("Should have thrown an IllegalArgumentException when " +
+        "creating a KeyValue with a null buffer");
+  }
+
   private static class FailureCase {
     byte[] buf;
     int offset;
@@ -681,7 +695,7 @@ public class TestKeyValue {
       "Overflow when reading family length at position=13",
       "Invalid family length in KeyValue, familyLength=1", "Timestamp cannot be negative, ts=-1",
       "Invalid type in KeyValue, type=3", "Overflow when reading value part at position=25",
-      "Invalid tags length in KeyValue at position=26", };
+      "Invalid tags length in KeyValue at position=26"};
     byte[][] withTagsInputs = new byte[][] {
       Bytes.toBytesBinary("\\x00\\x00\\x00\\x11\\x00\\x00\\x00\\x01\\x00\\x03ROW\\x01FQ\\x00"
           + "\\x00\\x00\\x00\\x00\\x00\\x00\\x01\\x04V\\x01"), // case.13