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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Yousuk Seung , Neal Cardwell , linux-kernel@vger.kernel.org (open list) Subject: [PATCH net v3 6/7] net/sched: netem: check for invalid slot range Date: Thu, 2 Apr 2026 13:19:34 -0700 Message-ID: <20260402202037.176299-7-stephen@networkplumber.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260402202037.176299-1-stephen@networkplumber.org> References: <20260402202037.176299-1-stephen@networkplumber.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Reject slot configuration where min_delay exceeds max_delay. The delay range computation in get_slot_next() underflows in this case, producing bogus results. Fixes: 0a9fe5c375b5 ("netem: slotting with non-uniform distribution") Signed-off-by: Stephen Hemminger --- net/sched/sch_netem.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c index e405bf862163..c82f76af41aa 100644 --- a/net/sched/sch_netem.c +++ b/net/sched/sch_netem.c @@ -883,6 +883,18 @@ static int get_dist_table(struct disttable **tbl, const struct nlattr *attr) return 0; } +static int validate_slot(const struct nlattr *attr, + struct netlink_ext_ack *extack) +{ + const struct tc_netem_slot *c = nla_data(attr); + + if (c->min_delay > c->max_delay) { + NL_SET_ERR_MSG(extack, "slot min delay greater than max delay"); + return -EINVAL; + } + return 0; +} + static void get_slot(struct netem_sched_data *q, const struct nlattr *attr) { const struct tc_netem_slot *c = nla_data(attr); @@ -1096,6 +1108,12 @@ static int netem_change(struct Qdisc *sch, struct nlattr *opt, goto table_free; } + if (tb[TCA_NETEM_SLOT]) { + ret = validate_slot(tb[TCA_NETEM_SLOT], extack); + if (ret) + goto table_free; + } + sch_tree_lock(sch); /* backup q->clg and q->loss_model */ old_clg = q->clg; -- 2.53.0