Index: sys/netinet/udp_usrreq.c
===================================================================
--- sys/netinet/udp_usrreq.c
+++ sys/netinet/udp_usrreq.c
@@ -398,7 +398,6 @@
 	struct inpcb *inp;
 	uint16_t len, ip_len;
 	struct inpcbinfo *pcbinfo;
-	struct ip save_ip;
 	struct sockaddr_in udp_in[2];
 	struct mbuf *m;
 	struct m_tag *fwd_tag;
@@ -474,15 +473,6 @@
 			m_adj(m, len - ip_len);
 	}
 
-	/*
-	 * Save a copy of the IP header in case we want restore it for
-	 * sending an ICMP error message in response.
-	 */
-	if (!V_udp_blackhole)
-		save_ip = *ip;
-	else
-		memset(&save_ip, 0, sizeof(save_ip));
-
 	/*
 	 * Checksum extended UDP header and data.
 	 */
@@ -714,7 +704,6 @@
 			goto badunlocked;
 		if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 			goto badunlocked;
-		*ip = save_ip;
 		icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 		return (IPPROTO_DONE);
 	}