diff --git a/net/core/dev.c b/net/core/dev.c
index 84f01ba81a34..0f28a9e0b8ad 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2444,8 +2444,12 @@ static void skb_update_prio(struct sk_buff *skb)
 {
 	struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap);
 
-	if ((!skb->priority) && (skb->sk) && map)
-		skb->priority = map->priomap[skb->sk->sk_cgrp_prioidx];
+	if (!skb->priority && skb->sk && map) {
+		unsigned int prioidx = skb->sk->sk_cgrp_prioidx;
+
+		if (prioidx < map->priomap_len)
+			skb->priority = map->priomap[prioidx];
+	}
 }
 #else
 #define skb_update_prio(skb)
diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index aa907ed466ea..3e953eaddbfc 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -142,7 +142,7 @@ static void cgrp_destroy(struct cgroup *cgrp)
 	rtnl_lock();
 	for_each_netdev(&init_net, dev) {
 		map = rtnl_dereference(dev->priomap);
-		if (map)
+		if (map && cs->prioidx < map->priomap_len)
 			map->priomap[cs->prioidx] = 0;
 	}
 	rtnl_unlock();
@@ -166,7 +166,7 @@ static int read_priomap(struct cgroup *cont, struct cftype *cft,
 	rcu_read_lock();
 	for_each_netdev_rcu(&init_net, dev) {
 		map = rcu_dereference(dev->priomap);
-		priority = map ? map->priomap[prioidx] : 0;
+		priority = (map && prioidx < map->priomap_len) ? map->priomap[prioidx] : 0;
 		cb->fill(cb, dev->name, priority);
 	}
 	rcu_read_unlock();