[PATCH] net: socket: fix a missing check for nla_nest_start

[Kangjie Lu]

nla_nest_start may fail. The fix check its status and returns
-EMSGSIZE in case it fails.

Signed-off-by: Kangjie Lu <kjlu@xxxxxxx>
---
 net/tipc/socket.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index e482b342bfa8..49ab8b27bde4 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -3255,6 +3255,8 @@ static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
 	peer_port = tsk_peer_port(tsk);
 
 	nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
+	if (!nest)
+		return -EMSGSIZE;
 
 	if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
 		goto msg_full;
-- 
2.17.1