单链表递增问题,能不能帮我找找哪有问题

检查链表是否按递增顺序排列，是的话返回1，不是返回0
能不能帮我找找为什么会这样

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

struct node {
    struct node *next;
    int          data;
};

int increasing(struct node *head);
struct node *strings_to_list(int len, char *strings[]);


//主程序
int main(int argc, char *argv[]) {
    // create linked list from command line arguments
    struct node *head = strings_to_list(argc - 1, &argv[1]);

    int result = increasing(head);
    printf("%d\n", result);

    return 0;
}


//这里有问题
int increasing(struct node *head) {
    while (head->next != NULL) {
        int v = head->data;
        if (v > head->next->data) {
            return 0;
        head = head->next;
        }
    }
    return 1;
}



//
struct node *strings_to_list(int len, char *strings[]) {
    struct node *head = NULL;
    for (int i = len - 1; i >= 0; i = i - 1) {
        struct node *n = malloc(sizeof (struct node));
        assert(n != NULL);
        n->next = head;
        n->data = atoi(strings[i]);
        head = n;
    }
    return head;
}