Try fixing #437

Author: cowtowncoder

ion/src/main/java/com/fasterxml/jackson/dataformat/ion/IonParser.java

@@ -593,8 +593,9 @@ public JsonToken nextToken() throws IOException
         } catch (IonException e) {
             return _reportCorruptContent(e);
 
-        } catch (IndexOutOfBoundsException | AssertionError e) {
-            // [dataformats-binary#420]: IonJava leaks IOOBEs so:
+//        } catch (AssertionError | IndexOutOfBoundsException | NullPointerException e) {
+        } catch (AssertionError | IndexOutOfBoundsException e) {
+            // [dataformats-binary#420]: IonJava leaks IOOBEs, catch
             // [dataformats-binary#432]: AssertionError if we're trying to get the text
             //   with a symbol id less than or equals to 0.
             return _reportCorruptContent(e);

ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/Fuzz437_65452_NPETest.java

@@ -0,0 +1,34 @@
+package com.fasterxml.jackson.dataformat.ion.fuzz;
+
+import java.io.*;
+
+import org.hamcrest.Matchers;
+import org.junit.Test;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonToken;
+import com.fasterxml.jackson.core.exc.StreamReadException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.ion.*;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+// [dataformats-binary#437]
+public class Fuzz437_65452_NPETest
+{
+    private final ObjectMapper ION_MAPPER = new IonObjectMapper();
+
+    @Test
+    public void testFuzz65452Eof() throws Exception {
+        try (InputStream in = getClass().getResourceAsStream("/data/fuzz-65452.ion")) {
+            try (JsonParser p = ION_MAPPER.createParser(in)) {
+                assertEquals(JsonToken.VALUE_FALSE, p.nextToken());
+            }
+            fail("Should not pass (invalid content)");
+        } catch (StreamReadException e) {
+            assertThat(e.getMessage(), Matchers.containsString("Corrupt content to decode"));
+        }
+    }
+}