[NETLINK]: Fix a severe bug

netlink overrun was broken while improvement of netlink.
Destination socket is used in the place where it was meant to be source socket,
so that now overrun is never sent to user netlink sockets, when it should be,
and it even can be set on kernel socket, which results in complete deadlock
of rtnetlink.

Suggested fix is to restore status quo passing source socket as additional
argument to netlink_attachskb().

A little explanation: overrun is set on a socket, when it failed
to receive some message and sender of this messages does not or even
have no way to handle this error. This happens in two cases:
1. when kernel sends something. Kernel never retransmits and cannot
   wait for buffer space.
2. when user sends a broadcast and the message was not delivered
   to some recipients.

Signed-off-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 8 insertions, 5 deletions

diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 6a2ccf78a356..c256ebe2a7b4 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -160,7 +160,8 @@ extern int netlink_unregister_notifier(struct notifier_block *nb);
 
 /* finegrained unicast helpers: */
 struct sock *netlink_getsockbyfilp(struct file *filp);
-int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, long timeo);
+int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock,
+                long timeo, struct sock *ssk);
 void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
 int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol);
 
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 59302fc3643b..fd2e26b6f966 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -1018,7 +1018,8 @@ retry:
                                 goto out;
                         }
 
-                        ret = netlink_attachskb(sock, nc, 0, MAX_SCHEDULE_TIMEOUT);
+                        ret = netlink_attachskb(sock, nc, 0,
+                                        MAX_SCHEDULE_TIMEOUT, NULL);
                         if (ret == 1)
                                 goto retry;
                         if (ret) {
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 2101b45d2ec6..6b9772d95872 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -702,7 +702,8 @@ struct sock *netlink_getsockbyfilp(struct file *filp)
  * 0: continue
  * 1: repeat lookup - reference dropped while waiting for socket memory.
  */
-int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, long timeo)
+int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock,
+                long timeo, struct sock *ssk)
 {
         struct netlink_sock *nlk;
 
@@ -712,7 +713,7 @@ int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, long t
             test_bit(0, &nlk->state)) {
                 DECLARE_WAITQUEUE(wait, current);
                 if (!timeo) {
-                        if (!nlk->pid)
+                        if (!ssk || nlk_sk(ssk)->pid == 0)
                                 netlink_overrun(sk);
                         sock_put(sk);
                         kfree_skb(skb);
@@ -797,7 +798,7 @@ retry:
                 kfree_skb(skb);
                 return PTR_ERR(sk);
         }
-        err = netlink_attachskb(sk, skb, nonblock, timeo);
+        err = netlink_attachskb(sk, skb, nonblock, timeo, ssk);
         if (err == 1)
                 goto retry;
         if (err)