output: #fixed code
                                public byte[] readBitsArray(final int items, final JBBPBitNumber bitNumber) throws IOException {
      return _readArray(items, bitNumber);
    }
input: #vulnerable code 
                                public byte[] readBitsArray(final int items, final JBBPBitNumber bitNumber) throws IOException {
      int pos = 0;
      if (items < 0) {
        byte[] buffer = new byte[INITIAL_ARRAY_BUFFER_SIZE];
        // till end
        while (true) {
          final int next = readBits(bitNumber);
          if (next < 0) {
            break;
          }
          if (buffer.length == pos) {
            final byte[] newbuffer = new byte[buffer.length << 1];
            System.arraycopy(buffer, 0, newbuffer, 0, buffer.length);
            buffer = newbuffer;
          }
          buffer[pos++] = (byte) next;
        }
        if (buffer.length == pos) {
          return buffer;
        }
        final byte[] result = new byte[pos];
        System.arraycopy(buffer, 0, result, 0, pos);
        return result;
      }
      else {
        // number
        final byte[] buffer = new byte[items];
        for (int i = 0; i < items; i++) {
          final int next = readBits(bitNumber);
          if (next < 0) {
            throw new EOFException("Have read only " + i + " bit portions instead of " + items);
          }
          buffer[i] = (byte) next;
        }
        return buffer;
      }
    } 
                              #location 7 
                              #vulnerability type THREAD_SAFETY_VIOLATION