diff --git a/include/net/udp.h b/include/net/udp.h
index 93dbe29..90e6ce5 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -124,8 +124,6 @@
 	sk_common_release(sk);
 }
 
-extern int	ipv4_rcv_saddr_equal(const struct sock *sk1,
-				    const struct sock *sk2);
 extern int	udp_lib_get_port(struct sock *sk, unsigned short snum,
 		int (*)(const struct sock*,const struct sock*));
 
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index bda08a0..7a1d1ce 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -222,7 +222,7 @@
 	return error;
 }
 
-int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
+static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
 {
 	struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2);
 
@@ -1823,7 +1823,6 @@
 EXPORT_SYMBOL(udp_lib_setsockopt);
 EXPORT_SYMBOL(udp_poll);
 EXPORT_SYMBOL(udp_lib_get_port);
-EXPORT_SYMBOL(ipv4_rcv_saddr_equal);
 
 #ifdef CONFIG_PROC_FS
 EXPORT_SYMBOL(udp_proc_register);
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 6842dd2..8905712 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -53,6 +53,8 @@
 {
 	const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
 	const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
+	__be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
+	__be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
 	int sk_ipv6only = ipv6_only_sock(sk);
 	int sk2_ipv6only = inet_v6_ipv6only(sk2);
 	int addr_type = ipv6_addr_type(sk_rcv_saddr6);
@@ -60,7 +62,9 @@
 
 	/* if both are mapped, treat as IPv4 */
 	if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
-		return ipv4_rcv_saddr_equal(sk, sk2);
+		return (!sk2_ipv6only &&
+			(!sk_rcv_saddr || !sk2_rcv_saddr ||
+			  sk_rcv_saddr == sk2_rcv_saddr));
 
 	if (addr_type2 == IPV6_ADDR_ANY &&
 	    !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))