#vulnerable code 
                                public static byte[] encodeBytesToBytes( byte[] source, int off, int len, int options ) throws java.io.IOException {

        if( source == null ){
            throw new NullPointerException( "Cannot serialize a null array." );
        }   // end if: null

        if( off < 0 ){
            throw new IllegalArgumentException( "Cannot have negative offset: " + off );
        }   // end if: off < 0

        if( len < 0 ){
            throw new IllegalArgumentException( "Cannot have length offset: " + len );
        }   // end if: len < 0

        if( off + len > source.length  ){
            throw new IllegalArgumentException(
            String.format( "Cannot have offset of %d and length of %d with array of length %d", off,len,source.length));
        }   // end if: off < 0



        // Compress?
        if( (options & GZIP) != 0 ) {
            java.io.ByteArrayOutputStream  baos  = null;
            java.util.zip.GZIPOutputStream gzos  = null;
            Base64.OutputStream            b64os = null;

            try {
                // GZip -> Base64 -> ByteArray
                baos = new java.io.ByteArrayOutputStream();
                b64os = new Base64.OutputStream( baos, ENCODE | options );
                gzos  = new java.util.zip.GZIPOutputStream( b64os );

                gzos.write( source, off, len );
                gzos.close();
            }   // end try
            catch( java.io.IOException e ) {
                // Catch it and then throw it immediately so that
                // the finally{} block is called for cleanup.
                throw e;
            }   // end catch
            finally {
                try{ gzos.close();  } catch( Exception e ){}
                try{ b64os.close(); } catch( Exception e ){}
                try{ baos.close();  } catch( Exception e ){}
            }   // end finally

            return baos.toByteArray();
        }   // end if: compress

        // Else, don't compress. Better not to use streams at all then.
        else {
            boolean breakLines = (options & DO_BREAK_LINES) != 0;

            //int    len43   = len * 4 / 3;
            //byte[] outBuff = new byte[   ( len43 )                      // Main 4:3
            //                           + ( (len % 3) > 0 ? 4 : 0 )      // Account for padding
            //                           + (breakLines ? ( len43 / MAX_LINE_LENGTH ) : 0) ]; // New lines
            // Try to determine more precisely how big the array needs to be.
            // If we get it right, we don't have to do an array copy, and
            // we save a bunch of memory.
            int encLen = ( len / 3 ) * 4 + ( len % 3 > 0 ? 4 : 0 ); // Bytes needed for actual encoding
            if( breakLines ){
                encLen += encLen / MAX_LINE_LENGTH; // Plus extra newline characters
            }
            byte[] outBuff = new byte[ encLen ];


            int d = 0;
            int e = 0;
            int len2 = len - 2;
            int lineLength = 0;
            for( ; d < len2; d+=3, e+=4 ) {
                encode3to4( source, d+off, 3, outBuff, e, options );

                lineLength += 4;
                if( breakLines && lineLength >= MAX_LINE_LENGTH )
                {
                    outBuff[e+4] = NEW_LINE;
                    e++;
                    lineLength = 0;
                }   // end if: end of line
            }   // en dfor: each piece of array

            if( d < len ) {
                encode3to4( source, d+off, len - d, outBuff, e, options );
                e += 4;
            }   // end if: some padding needed


            // Only resize array if we didn't guess it right.
            if( e <= outBuff.length - 1 ){
                // If breaking lines and the last byte falls right at
                // the line length (76 bytes per line), there will be
                // one extra byte, and the array will need to be resized.
                // Not too bad of an estimate on array size, I'd say.
                byte[] finalOut = new byte[e];
                System.arraycopy(outBuff,0, finalOut,0,e);
                //System.err.println("Having to resize array from " + outBuff.length + " to " + e );
                return finalOut;
            } else {
                //System.err.println("No need to resize array.");
                return outBuff;
            }
        
        }   // end else: don't compress

    } 
                            #location 43 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public static byte[] encodeBytesToBytes( byte[] source, int off, int len, int options ) throws java.io.IOException {

        if( source == null ){
            throw new NullPointerException( "Cannot serialize a null array." );
        }   // end if: null

        if( off < 0 ){
            throw new IllegalArgumentException( "Cannot have negative offset: " + off );
        }   // end if: off < 0

        if( len < 0 ){
            throw new IllegalArgumentException( "Cannot have length offset: " + len );
        }   // end if: len < 0

        if( off + len > source.length  ){
            throw new IllegalArgumentException(
            String.format( "Cannot have offset of %d and length of %d with array of length %d", off,len,source.length));
        }   // end if: off < 0



        // Compress?
        if( (options & GZIP) != 0 ) {
            java.io.ByteArrayOutputStream  baos  = null;
            java.util.zip.GZIPOutputStream gzos  = null;
            Base64.OutputStream            b64os = null;

            try {
                // GZip -> Base64 -> ByteArray
                baos = new java.io.ByteArrayOutputStream();
                b64os = new Base64.OutputStream( baos, ENCODE | options );
                gzos  = new java.util.zip.GZIPOutputStream( b64os );

                gzos.write( source, off, len );
                gzos.close();
            }   // end try
            catch( java.io.IOException e ) {
                // Catch it and then throw it immediately so that
                // the finally{} block is called for cleanup.
                throw e;
            }   // end catch
            finally {
                try {
    				if (gzos != null) gzos.close();
    			} finally {
    				try {
    					if (b64os != null) b64os.close();
    				} finally {
    					if (baos != null) baos.close();
    				}
    			}
            }   // end finally

            return baos.toByteArray();
        }   // end if: compress

        // Else, don't compress. Better not to use streams at all then.
        else {
            boolean breakLines = (options & DO_BREAK_LINES) != 0;

            //int    len43   = len * 4 / 3;
            //byte[] outBuff = new byte[   ( len43 )                      // Main 4:3
            //                           + ( (len % 3) > 0 ? 4 : 0 )      // Account for padding
            //                           + (breakLines ? ( len43 / MAX_LINE_LENGTH ) : 0) ]; // New lines
            // Try to determine more precisely how big the array needs to be.
            // If we get it right, we don't have to do an array copy, and
            // we save a bunch of memory.
            int encLen = ( len / 3 ) * 4 + ( len % 3 > 0 ? 4 : 0 ); // Bytes needed for actual encoding
            if( breakLines ){
                encLen += encLen / MAX_LINE_LENGTH; // Plus extra newline characters
            }
            byte[] outBuff = new byte[ encLen ];


            int d = 0;
            int e = 0;
            int len2 = len - 2;
            int lineLength = 0;
            for( ; d < len2; d+=3, e+=4 ) {
                encode3to4( source, d+off, 3, outBuff, e, options );

                lineLength += 4;
                if( breakLines && lineLength >= MAX_LINE_LENGTH )
                {
                    outBuff[e+4] = NEW_LINE;
                    e++;
                    lineLength = 0;
                }   // end if: end of line
            }   // en dfor: each piece of array

            if( d < len ) {
                encode3to4( source, d+off, len - d, outBuff, e, options );
                e += 4;
            }   // end if: some padding needed


            // Only resize array if we didn't guess it right.
            if( e <= outBuff.length - 1 ){
                // If breaking lines and the last byte falls right at
                // the line length (76 bytes per line), there will be
                // one extra byte, and the array will need to be resized.
                // Not too bad of an estimate on array size, I'd say.
                byte[] finalOut = new byte[e];
                System.arraycopy(outBuff,0, finalOut,0,e);
                //System.err.println("Having to resize array from " + outBuff.length + " to " + e );
                return finalOut;
            } else {
                //System.err.println("No need to resize array.");
                return outBuff;
            }
        
        }   // end else: don't compress

    }