diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index 0d48c61fe6ad..0c56d9673cc1 100644
--- a/net/sctp/transport.c
+++ b/net/sctp/transport.c
@@ -486,6 +486,7 @@ void sctp_transport_update_rto(struct sctp_transport *tp, __u32 rtt)
 
 	if (tp->rttvar || tp->srtt) {
 		struct net *net = tp->asoc->base.net;
+		unsigned int rto_beta, rto_alpha;
 		/* 6.3.1 C3) When a new RTT measurement R' is made, set
 		 * RTTVAR <- (1 - RTO.Beta) * RTTVAR + RTO.Beta * |SRTT - R'|
 		 * SRTT <- (1 - RTO.Alpha) * SRTT + RTO.Alpha * R'
@@ -497,10 +498,14 @@ void sctp_transport_update_rto(struct sctp_transport *tp, __u32 rtt)
 		 * For example, assuming the default value of RTO.Alpha of
 		 * 1/8, rto_alpha would be expressed as 3.
 		 */
-		tp->rttvar = tp->rttvar - (tp->rttvar >> net->sctp.rto_beta)
-			+ (((__u32)abs((__s64)tp->srtt - (__s64)rtt)) >> net->sctp.rto_beta);
-		tp->srtt = tp->srtt - (tp->srtt >> net->sctp.rto_alpha)
-			+ (rtt >> net->sctp.rto_alpha);
+		rto_beta = READ_ONCE(net->sctp.rto_beta);
+		if (rto_beta < 32)
+			tp->rttvar = tp->rttvar - (tp->rttvar >> rto_beta)
+				+ (((__u32)abs((__s64)tp->srtt - (__s64)rtt)) >> rto_beta);
+		rto_alpha = READ_ONCE(net->sctp.rto_alpha);
+		if (rto_alpha < 32)
+			tp->srtt = tp->srtt - (tp->srtt >> rto_alpha)
+				+ (rtt >> rto_alpha);
 	} else {
 		/* 6.3.1 C2) When the first RTT measurement R is made, set
 		 * SRTT <- R, RTTVAR <- R/2.