void PSOutputDev::addCustomColor(GfxSeparationColorSpace *sepCS) {
  PSOutCustomColor *cc;
  GfxColor color;
  GfxCMYK cmyk;

  for (cc = customColors; cc; cc = cc->next) {
    if (!cc->name->cmp(sepCS->getName())) {
      return;
    }
  }
  color.c[0] = gfxColorComp1;
  sepCS->getCMYK(&color, &cmyk);
  cc = new PSOutCustomColor(colToDbl(cmyk.c), colToDbl(cmyk.m),
			    colToDbl(cmyk.y), colToDbl(cmyk.k),
			    sepCS->getName()->copy());
  cc->next = customColors;
  customColors = cc;
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.