ddressSanitizer: heap-use-after-free on address.....

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报错代码

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode(int x) : val(x), next(NULL) {}
 * };
 */
class Solution {
public:
    ListNode* reverseList(ListNode* head) {
        ListNode* curv=NULL;
        ListNode* prev=NULL;
        ListNode* nextv=NULL;
        if(head == NULL || head->next == NULL) return head;
        prev = head;
        curv = prev->next;
        while(curv){
            
            nextv = curv->next;
            curv->next = prev;
            prev = curv;
            curv = nextv;
        }

    return prev;  

    }
};

正确代码

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode(int x) : val(x), next(NULL) {}
 * };
 */
class Solution {
public:
    ListNode* reverseList(ListNode* head) {
        ListNode* curv=NULL;
        ListNode* prev=NULL;
        ListNode* nextv=NULL;
        if(head == NULL || head->next == NULL) return head;
        curv =head ;
        while(curv){
            
            nextv = curv->next;
            curv->next = prev;
            prev = curv;
            curv = nextv;
        }

    return prev;  

    }
};

区别在于prev = head;
        curv = prev->next;

改成  curv =head；

错误分析：

Use after free：访问堆上已经被释放的内存
Heap buffer overflow：堆上缓冲区访问溢出
Stack buffer overflow：栈上缓冲区访问溢出
Global buffer overflow：全局缓冲区访问溢出
Use after return：访问栈上已被释放的内存
Use after scope：栈对象使用超过定义范围
Initialization order bugs：初始化命令错误
Memory leaks：内存泄漏