        function singleRead(psrc, pdst, chunk) {
          src.read(srcHandle,
                   readbuf,
                   psrc,
                   chunk,
                   pdst,
                   makeCb(psrc, pdst, chunk));
        }
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.