golang code, upload image through file

f, err := ctx.FormFile("file")
    if err != nil {
        return err  
} 

will this cause OOM? what if the file is huge

I look into the source code of golang, found os.Open() in ctx.FormFile(“file”) function

// Open opens and returns the FileHeader's associated File.
func (fh *FileHeader) Open() (File, error) {
    if b := fh.content; b != nil {
        r := io.NewSectionReader(bytes.NewReader(b), 0, int64(len(b)))
        return sectionReadCloser{r, nil}, nil
    }
    if fh.tmpshared {
        f, err := os.Open(fh.tmpfile)
        if err != nil {
            return nil, err
        }
        r := io.NewSectionReader(f, fh.tmpoff, fh.Size)
        return sectionReadCloser{r, f}, nil
    }
    return os.Open(fh.tmpfile)
}