OpenWrt – Rev 4

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--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -90,6 +90,9 @@ int nf_xfrm_me_harder(struct sk_buff *sk
        struct dst_entry *dst;
        int err;
 
+       if (skb->dev && !dev_net(skb->dev)->xfrm.policy_count[XFRM_POLICY_OUT])
+               return 0;
+
        err = xfrm_decode_session(skb, &fl, family);
        if (err < 0)
                return err;