[NETLINK]: Fix ACK processing after netlink_dump_start

[safe/jmp/linux-2.6] / net / netlink / af_netlink.c

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 98e313e..3252729 100644 (file)
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1565,7 +1565,11 @@ int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
 
        netlink_dump(sk);
        sock_put(sk);
-       return 0;
+
+       /* We successfully started a dump, by returning -EINTR we
+        * signal not to send ACK even if it was requested.
+        */
+       return -EINTR;
 }
 
 void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err)
@@ -1619,17 +1623,21 @@ int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *,
 
                /* Only requests are handled by the kernel */
                if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
-                       goto skip;
+                       goto ack;
 
                /* Skip control messages */
                if (nlh->nlmsg_type < NLMSG_MIN_TYPE)
-                       goto skip;
+                       goto ack;
 
                err = cb(skb, nlh);
-skip:
+               if (err == -EINTR)
+                       goto skip;
+
+ack:
                if (nlh->nlmsg_flags & NLM_F_ACK || err)
                        netlink_ack(skb, nlh, err);
 
+skip:
                msglen = NLMSG_ALIGN(nlh->nlmsg_len);
                if (msglen > skb->len)
                        msglen = skb->len;