Does allocating using sizeof yield wrong size for structure pointers?

Question

Using valgrind to read this I get: Invalid write/read of size 4

 struct Person{
        char* name;
        int age;
    };

    struct Person* create_pers         


        

Answer 1

Because you want to allocate enough space to hold an entire structure, not just a pointer to it.

That is, use sizeof(struct Person) and not sizeof(struct Person*).

sizeof(struct Person*)+4 is coincidentally big enough on your platform.