segfault help

void read_objs (OBJ_T **list)
{
  double ctrx, ctry, ctrz, r, R, G, B;
  OBJ_T *node;
  while(scanf("%lf %lf %lf %lf %lf %lf %lf ", &ctrx, &ctry, &ctrz, &r, &R, &G, &B) == 7)
  {

    node = (OBJ_T*)malloc(sizeof(OBJ_T));// cast malloc to on
    node->sphere.ctr.x = ctrx;
    node->sphere.ctr.y = ctry;
    node->sphere.ctr.z = ctrz;
    node->sphere.r = r;
    node->color.R = R;
    node->color.G = G;
    node->color.B = B;

    node->next = *list;
    //node.next goes to list, list goes to node
    *list = node;
    free(node);
  }
}