===== include/linux/netlink.h 1.15 vs edited =====
--- 1.15/include/linux/netlink.h	2004-04-17 02:24:35 +10:00
+++ edited/include/linux/netlink.h	2004-06-30 22:34:18 +10:00
@@ -90,6 +90,11 @@
 
 #define NET_MAJOR 36		/* Major 36 is reserved for networking 						*/
 
+enum {
+	NETLINK_UNCONNECTED = 0,
+	NETLINK_CONNECTED,
+};
+
 #ifdef __KERNEL__
 
 #include <linux/capability.h>
===== net/netlink/af_netlink.c 1.48 vs edited =====
--- 1.48/net/netlink/af_netlink.c	2004-06-19 04:43:31 +10:00
+++ edited/net/netlink/af_netlink.c	2004-06-30 22:34:24 +10:00
@@ -365,6 +365,7 @@
 	struct sockaddr_nl *nladdr=(struct sockaddr_nl*)addr;
 
 	if (addr->sa_family == AF_UNSPEC) {
+		sk->sk_state	= NETLINK_UNCONNECTED;
 		nlk->dst_pid	= 0;
 		nlk->dst_groups = 0;
 		return 0;
@@ -380,6 +381,7 @@
 		err = netlink_autobind(sock);
 
 	if (err == 0) {
+		sk->sk_state	= NETLINK_CONNECTED;
 		nlk->dst_pid 	= nladdr->nl_pid;
 		nlk->dst_groups = nladdr->nl_groups;
 	}
@@ -428,6 +430,12 @@
 	/* Don't bother queuing skb if kernel socket has no input function */
 	nlk = nlk_sk(sock);
 	if (nlk->pid == 0 && !nlk->data_ready) {
+		sock_put(sock);
+		return ERR_PTR(-ECONNREFUSED);
+	}
+
+	if (sock->sk_state == NETLINK_CONNECTED &&
+	    nlk->dst_pid != nlk_sk(ssk)->pid) {
 		sock_put(sock);
 		return ERR_PTR(-ECONNREFUSED);
 	}