netfilter: nat: never update the UDP checksum when it's 0

(bsc#1176447). suse-commit: d8ede2a6011026df730f4dfbcb94d14f999c615a
SUSE · Sep 28, 2020 · 3dc74ef · 3dc74ef
1 parent b395419
commit 3dc74ef
Showing 1 changed file with 1 addition and 3 deletions.
diff --git a/net/netfilter/nf_nat_proto.c b/net/netfilter/nf_nat_proto.c
@@ -68,15 +68,13 @@ static bool udp_manip_pkt(struct sk_buff *skb,
 			  enum nf_nat_manip_type maniptype)
 {
 	struct udphdr *hdr;
-	bool do_csum;
 
 	if (skb_ensure_writable(skb, hdroff + sizeof(*hdr)))
 		return false;
 
 	hdr = (struct udphdr *)(skb->data + hdroff);
-	do_csum = hdr->check || skb->ip_summed == CHECKSUM_PARTIAL;
+	__udp_manip_pkt(skb, iphdroff, hdr, tuple, maniptype, !!hdr->check);
 
-	__udp_manip_pkt(skb, iphdroff, hdr, tuple, maniptype, do_csum);
 	return true;
 }