Fix OSS-Fuzz reported issue with SmileParser.getTextLength(), NPE (#423)

Author: cowtowncoder

cbor/src/main/java/com/fasterxml/jackson/dataformat/cbor/CBORParser.java

@@ -1679,7 +1679,10 @@ public int getTextLength() throws IOException
                     || (_currToken == JsonToken.VALUE_NUMBER_FLOAT)) {
                 return getNumberValue().toString().length();
             }
-            return _currToken.asCharArray().length;
+            final char[] ch = _currToken.asCharArray();
+            if (ch != null) {
+                return ch.length;
+            }
         }
         return 0;
     }

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

@@ -314,7 +314,8 @@ public char[] getTextCharacters() throws IOException {
 
     @Override
     public int getTextLength() throws IOException {
-        return getText().length();
+        String str = getText();
+        return (str == null) ? 0 : str.length();
     }
 
     @Override

protobuf/src/main/java/com/fasterxml/jackson/dataformat/protobuf/ProtobufParser.java

@@ -1373,13 +1373,15 @@ public int getTextLength() throws IOException
                 return _textBuffer.size();
             case FIELD_NAME:
                 return _parsingContext.getCurrentName().length();
-                // fall through
             case VALUE_NUMBER_INT:
             case VALUE_NUMBER_FLOAT:
                 return getNumberValue().toString().length();
-
             default:
-                return _currToken.asCharArray().length;
+                // fall through
+            }
+            final char[] ch = _currToken.asCharArray();
+            if (ch != null) {
+                return ch.length;
             }
         }
         return 0;

smile/src/main/java/com/fasterxml/jackson/dataformat/smile/SmileParser.java

@@ -1139,7 +1139,10 @@ public int getTextLength() throws IOException
                 // TODO: optimize
                 return getNumberValue().toString().length();
             }
-            return _currToken.asCharArray().length;
+            final char[] ch = _currToken.asCharArray();
+            if (ch != null) {
+                return ch.length;
+            }
         }
         return 0;
     }

smile/src/main/java/com/fasterxml/jackson/dataformat/smile/async/NonBlockingParserBase.java

@@ -328,7 +328,11 @@ public int getTextLength() throws IOException
         case JsonTokenId.ID_NOT_AVAILABLE:
             return 0; // or throw exception?
         default:
-            return _currToken.asCharArray().length;
+            final char[] ch = _currToken.asCharArray();
+            if (ch != null) {
+                return ch.length;
+            }
+            return 0;
         }
     }