diff --git a/net/sched/sch_dualpi2.c b/net/sched/sch_dualpi2.c
index 4f678d4ff10e..4947def7c49e 100644
--- a/net/sched/sch_dualpi2.c
+++ b/net/sched/sch_dualpi2.c
@@ -208,9 +208,11 @@ static void dualpi2_reset_c_protection(struct dualpi2_sched_data *q)
 static void dualpi2_calculate_c_protection(struct Qdisc *sch,
 					   struct dualpi2_sched_data *q, u32 wc)
 {
+	u32 mtu = clamp_t(u32, psched_mtu(qdisc_dev(sch)), 1, 1 << 20);
+
 	q->c_protection_wc = wc;
 	q->c_protection_wl = MAX_WC - wc;
-	q->c_protection_init = (s32)psched_mtu(qdisc_dev(sch)) *
+	q->c_protection_init = (s32)mtu *
 		((int)q->c_protection_wc - (int)q->c_protection_wl);
 	dualpi2_reset_c_protection(q);
 }
@@ -285,8 +287,9 @@ static bool must_drop(struct Qdisc *sch, struct dualpi2_sched_data *q,
 	u64 local_l_prob;
 	bool overload;
 	u32 prob;
+	u32 mtu = clamp_t(u32, psched_mtu(qdisc_dev(sch)), 1, 1 << 20);
 
-	if (sch->qstats.backlog < 2 * psched_mtu(qdisc_dev(sch)))
+	if (sch->qstats.backlog < 2 * mtu)
 		return false;
 
 	prob = READ_ONCE(q->pi2_prob);
@@ -712,7 +715,8 @@ static u32 get_memory_limit(struct Qdisc *sch, u32 limit)
 	/* Apply rule of thumb, i.e., doubling the packet length,
 	 * to further include per packet overhead in memory_limit.
 	 */
-	u64 memlim = mul_u32_u32(limit, 2 * psched_mtu(qdisc_dev(sch)));
+	u64 memlim = mul_u32_u32(limit, 2 * clamp_t(u32, psched_mtu(qdisc_dev(sch)),
+						     1, 1 << 20));
 
 	if (upper_32_bits(memlim))
 		return U32_MAX;