struct kern_ipc_perm *ipcctl_pre_down_nolock(struct ipc_namespace *ns,
					     struct ipc_ids *ids, int id, int cmd,
					     struct ipc64_perm *perm, int extra_perm)
{
	kuid_t euid;
	int err = -EPERM;
	struct kern_ipc_perm *ipcp;

	down_write(&ids->rw_mutex);
	rcu_read_lock();

	ipcp = ipc_obtain_object_check(ids, id);
	if (IS_ERR(ipcp)) {
		err = PTR_ERR(ipcp);
		goto out_up;
	}

	audit_ipc_obj(ipcp);
	if (cmd == IPC_SET)
		audit_ipc_set_perm(extra_perm, perm->uid,
				   perm->gid, perm->mode);

	euid = current_euid();
	if (uid_eq(euid, ipcp->cuid) || uid_eq(euid, ipcp->uid)  ||
	    ns_capable(ns->user_ns, CAP_SYS_ADMIN))
		return ipcp;

out_up:
	/*
	 * Unsuccessful lookup, unlock and return
	 * the corresponding error.
	 */
	rcu_read_unlock();
	up_write(&ids->rw_mutex);

	return ERR_PTR(err);
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.