static int ucma_set_ib_path(struct ucma_context *ctx,
			    struct ib_path_rec_data *path_data, size_t optlen)
{
	struct sa_path_rec sa_path;
	struct rdma_cm_event event;
	int ret;

	if (optlen % sizeof(*path_data))
		return -EINVAL;

	for (; optlen; optlen -= sizeof(*path_data), path_data++) {
		if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
					 IB_PATH_BIDIRECTIONAL))
			break;
	}

	if (!optlen)
		return -EINVAL;

	if (!ctx->cm_id->device)
		return -EINVAL;

	memset(&sa_path, 0, sizeof(sa_path));

	sa_path.rec_type = SA_PATH_REC_TYPE_IB;
	ib_sa_unpack_path(path_data->path_rec, &sa_path);

	if (rdma_cap_opa_ah(ctx->cm_id->device, ctx->cm_id->port_num)) {
		struct sa_path_rec opa;

		sa_convert_path_ib_to_opa(&opa, &sa_path);
		ret = rdma_set_ib_path(ctx->cm_id, &opa);
	} else {
		ret = rdma_set_ib_path(ctx->cm_id, &sa_path);
	}
	if (ret)
		return ret;

	memset(&event, 0, sizeof event);
	event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
	return ucma_event_handler(ctx->cm_id, &event);
}

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.