[TIPC]: Fix infinite loop in netlink handler

The tipc netlink config handler uses the nlmsg_pid from the
request header as destination for its reply. If the application
initialized nlmsg_pid to 0, the reply is looped back to the kernel,
causing hangup. Fix: use nlmsg_pid of the skb that triggered the
request.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/tipc/netlink.c b/net/tipc/netlink.c
index 4cdafa2..6a7f7b4 100644 (file)
--- a/net/tipc/netlink.c
+++ b/net/tipc/netlink.c
@@ -60,7 +60,7 @@ static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
                rep_nlh = nlmsg_hdr(rep_buf);
                memcpy(rep_nlh, req_nlh, hdr_space);
                rep_nlh->nlmsg_len = rep_buf->len;
-               genlmsg_unicast(rep_buf, req_nlh->nlmsg_pid);
+               genlmsg_unicast(rep_buf, NETLINK_CB(skb).pid);
        }
 
        return 0;