Why does accessing a member of a malloced array of structs seg fault?
- by WSkinner
I am working through Learn C The Hard Way and am stumped on something. I've written a simplified version of the problem I am running into to make it easier to get down to it. Here is the code:
#include <stdlib.h>
#define GROUP_SIZE 10
#define DATA_SIZE 64
struct Dummy {
char *name;
};
struct Group {
struct Dummy **dummies;
};
int main() {
struct Group *group1 = malloc(sizeof(struct Group));
group1->dummies = malloc(sizeof(struct Dummy) * GROUP_SIZE);
struct Dummy *dummy1 = group1->dummies[3];
// Why does this seg fault?
dummy1->name = (char *) malloc(DATA_SIZE);
return 0;
}
when I try to set the name pointer on one of my dummies I get a seg fault. Using valgrind it tells me this is uninitialized space. Why is this?
