--- zzzz-none-000/linux-4.4.60/net/netlink/af_netlink.c	2017-04-08 07:53:53.000000000 +0000
+++ hawkeye-5590-729/linux-4.4.60/net/netlink/af_netlink.c	2022-03-30 14:21:53.000000000 +0000
@@ -223,6 +223,9 @@
 	struct sock *sk = skb->sk;
 	int ret = -ENOMEM;
 
+	if (!net_eq(dev_net(dev), sock_net(sk)))
+		return 0;
+
 	dev_hold(dev);
 
 	if (is_vmalloc_addr(skb->head))
@@ -1187,24 +1190,7 @@
 
 static struct sk_buff *netlink_trim(struct sk_buff *skb, gfp_t allocation)
 {
-	int delta;
-
 	WARN_ON(skb->sk != NULL);
-	delta = skb->end - skb->tail;
-	if (is_vmalloc_addr(skb->head) || delta * 2 < skb->truesize)
-		return skb;
-
-	if (skb_shared(skb)) {
-		struct sk_buff *nskb = skb_clone(skb, allocation);
-		if (!nskb)
-			return skb;
-		consume_skb(skb);
-		skb = nskb;
-	}
-
-	if (!pskb_expand_head(skb, 0, -delta, allocation))
-		skb->truesize -= delta;
-
 	return skb;
 }
 
@@ -2362,7 +2348,8 @@
 {
 	int err;
 
-	err = rhashtable_walk_init(&nl_table[iter->link].hash, &iter->hti);
+	err = rhashtable_walk_init(&nl_table[iter->link].hash,
+				   &iter->hti, GFP_KERNEL);
 	if (err) {
 		iter->link = MAX_LINKS;
 		return err;