以下 C 代码中的内存泄漏
我如何释放从以下代码泄漏的内存。
struct object_one{
int value;
}*object,object_node;
struct node_one {
void **pointers;
}*node, node_node;
node sample(){
object number;
node node123;
node123 = malloc(sizeof(node_node));
number = malloc(sizeof(object_node));
number->valu = malloc(sizeof(int));
number->value = 9;
node123->pointers[0]=number;
free(number);
return node123;
}
我是否正在采取正确的方法来释放 number 引用的内存。一旦我执行了上述操作，我就会收到错误；
Invalid read of size 4
==15957== at 0x403804: main (abc.c:1255)
==15957== Address 0x540cb50 is 0 bytes inside a block of size 4 free'd
请建议我如何防止这种情况下的内存泄漏？提前致谢。
[编辑]
嗨，实际上上面提到的不是我真正的代码。但我已尽力反映我的代码的结构和语义。实际上我正在实现一个数据结构。 number 是一些临时存储，node123 是我真正的数据库。我想在数据库中分配 number 的值并取消引用它。number 类型是数据库的一个组件。
[EDIT2]
对应于行 1255 的代码正在打印 object i'e value 所保存的值。它看起来像：
object tempObject;
tempObject = search_object(root,50);
[1255] printf("Key is %d ------>value is %d\n",50,tempObject->value);
这里是函数 search_object 搜索与键 50 对应的值。该函数返回与该键关联的正确值，但仍然显示此类错误。
How would i free the memory that is leaking fromt he following code.
struct object_one{
int value;
}*object,object_node;
struct node_one {
void **pointers;
}*node, node_node;
node sample(){
object number;
node node123;
node123 = malloc(sizeof(node_node));
number = malloc(sizeof(object_node));
number->valu = malloc(sizeof(int));
number->value = 9;
node123->pointers[0]=number;
free(number);
return node123;
}
Am I doing the correct way to deallocate the memory referenced by number.Once i do the above one, i get the error;
Invalid read of size 4
==15957== at 0x403804: main (abc.c:1255)
==15957== Address 0x540cb50 is 0 bytes inside a block of size 4 free'd
Please suggest me how can I prevent the memory leak in this condition? Thanks in advance.
[EDIT]
Hi actually the above mentioned is not the real code I have. But I have tried my best to refelect the sturcutre and semantics of my code. Actually I am implementing a data strcture. number is some temproary storage and node123 is my real data-base. I would like to assign the value of number in the database and dereference it.number type is a component of database.
[EDIT2]
The code corresponding to line 1255 is printing for the value that is holded by the object i'e value.It looks like:
object tempObject;
tempObject = search_object(root,50);
[1255] printf("Key is %d ------>value is %d\n",50,tempObject->value);
Here the functionsearch_object searches the value corresponding to the key 50. The function is returning the proper value associated with the key and still it is showing such error.
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评论（3）
您还需要
free(node123)。但这不是错误消息告诉您的内容。
您还取消引用未指向有效内存的指针（在
node123->pointers[0] = number 行上） ）。您尚未为指针分配任何内存来指向，因此像这样取消引用将写入内存中的随机区域。You also need to
free(node123).But this is not what the error message is telling you.
You are also dereferencing a pointer that doesn't point at valid memory (on the line
node123->pointers[0] = number). You have not allocated any memory forpointersto point at, so dereferencing it like this will write to a random area in memory.看来您忘记释放（node123）了。
对于每个 malloc() 调用，您都必须有一个 free() 调用。
您显示的 valgrind 错误不是内存泄漏，而是已释放的内存区域中的无效读取。
它发生在 abc.c 的第 1255 行。
You forgot to free(node123), it seems.
For each malloc() call you must have a free() call.
The valgrind error you show is not a memory leak, it's an invalid read in a memory region that has been free'd.
It happens in abc.c at line 1255.
你忘记了一个 free(node123);
还有这一行：node123->pointers[0]=number;是个麻烦。
您没有初始化node123内的指针。
You forgot a free(node123);
And also this line: node123->pointers[0]=number; is a trouble.
You didn't initialized pointers inside node123.