[Solved] malloc: *** error for object 0x147606ac0: pointer being realloc’d was not allocated

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The function is not updating the caller’s value of client_details, you need one more level of pointer:

void func(struct client_detail **client_details,int *size){
    *client_details = realloc(*client_details, (*size + 1) * sizeof(**client_details));
    *size = *size + 1;
}

int main()
{
    struct group_detail *group_details = malloc(0 * sizeof(*group_details));
    struct client_detail *client_details = malloc(1 * sizeof(*client_details));
    int size = 0;
    int j = 0;
    while(j < 100){
        func(&client_details,&size);
        j++;
    }
    return 0;
}

Similar as with size, if you just wanted the value, the type would be int. Changing an int size variable inside the function would not have any effect on the caller. You want to change it, so you make a pointer to int int * and dereference it to read/write the value.

With void func(struct client_detail *client_details,int *size){ you are getting the client_details pointer by value and changing that will have no effect on the caller’s variable. You need to add a pointer-to-it similar as was done for size.

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solved malloc: *** error for object 0x147606ac0: pointer being realloc’d was not allocated