leetcode 002 add two numbers C语言

struct ListNode addTwoNumbers(struct ListNode l1, struct ListNode* l2)
{

struct ListNode *l, *p;
l = (struct ListNode*)malloc(sizeof(struct ListNode));
l->val = l1->val + l2->val;
p = l;
l1 = l1->next;
l2 = l2->next;
while(l1||l2||p->val>9)
{
    p->next = (struct ListNode*)malloc(sizeof(struct ListNode));
    p->next->val = p->val/10;
    p->val %= 10;
    p = p->next;

    if(l1) 
    {
        p->val += l1->val;
        l1 = l1->next;
    }
     if(l2) 
    {
        p->val += l2->val;
        l2 = l2->next;
    }
}
return l;

}
请问这样有错吗？我自己反复看了觉得没有问题啊，原题 如下
You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.
Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8