diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index fd73be940f46..77a76634014a 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -529,6 +529,8 @@ static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
 	return ret;
 }
 
+static DEFINE_MUTEX(sctp_sysctl_mutex);
+
 static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write,
 				 void *buffer, size_t *lenp, loff_t *ppos)
 {
@@ -553,6 +555,7 @@ static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write,
 		if (new_value > max || new_value < min)
 			return -EINVAL;
 
+		mutex_lock(&sctp_sysctl_mutex);
 		net->sctp.udp_port = new_value;
 		sctp_udp_sock_stop(net);
 		if (new_value) {
@@ -565,6 +568,7 @@ static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write,
 		lock_sock(sk);
 		sctp_sk(sk)->udp_port = htons(net->sctp.udp_port);
 		release_sock(sk);
+		mutex_unlock(&sctp_sysctl_mutex);
 	}
 
 	return ret;