diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 6e217424e0ff..3c09bee931b7 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -2171,7 +2171,7 @@ int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
 		count++;
 	}
 	err = -ENOBUFS;
-	if (count >= net->ipv4.sysctl_igmp_max_memberships)
+	if (count >= READ_ONCE(net->ipv4.sysctl_igmp_max_memberships))
 		goto done;
 	iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
 	if (!iml)