diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index a1d27bc039a3..d26ac6bd9b10 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -1664,6 +1664,10 @@ replay: q = qdisc_lookup(dev, tcm->tcm_handle); if (!q) goto create_n_graft; + if (q->parent != tcm->tcm_parent) { + NL_SET_ERR_MSG(extack, "Cannot move an existing qdisc to a different parent"); + return -EINVAL; + } if (n->nlmsg_flags & NLM_F_EXCL) { NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override"); return -EEXIST;