xsltSwapTopCompMatch(xsltCompMatchPtr comp) {
    int i;
    int j = comp->nbStep - 1;

    if (j > 0) {
	register xmlChar *tmp;
	register xsltOp op;
	register xmlXPathCompExprPtr expr; 
	register int t;
	i = j - 1;
	tmp = comp->steps[i].value;
	comp->steps[i].value = comp->steps[j].value;
	comp->steps[j].value = tmp;
	tmp = comp->steps[i].value2;
	comp->steps[i].value2 = comp->steps[j].value2;
	comp->steps[j].value2 = tmp;
	tmp = comp->steps[i].value3;
	comp->steps[i].value3 = comp->steps[j].value3;
	comp->steps[j].value3 = tmp;
	op = comp->steps[i].op;
	comp->steps[i].op = comp->steps[j].op;
	comp->steps[j].op = op;
	expr = comp->steps[i].comp;
	comp->steps[i].comp = comp->steps[j].comp;
	comp->steps[j].comp = expr;
	t = comp->steps[i].previousExtra;
	comp->steps[i].previousExtra = comp->steps[j].previousExtra;
	comp->steps[j].previousExtra = t;
	t = comp->steps[i].indexExtra;
	comp->steps[i].indexExtra = comp->steps[j].indexExtra;
	comp->steps[j].indexExtra = t;
	t = comp->steps[i].lenExtra;
	comp->steps[i].lenExtra = comp->steps[j].lenExtra;
	comp->steps[j].lenExtra = t;
    }
}

This vulnerability category highlights issues in resource management where failures to properly release memory, file handles, or other resources can degrade system performance or enable denial-of-service conditions.