[PATCH 3.16.y-ckt 006/165] ipvs: add missing ip_vs_pe_put in sync code

[Luis Henriques]

3.16.7-ckt9 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Julian Anastasov <ja at ssi.bg>

commit 528c943f3bb919aef75ab2fff4f00176f09a4019 upstream.

ip_vs_conn_fill_param_sync() gets in param.pe a module
reference for persistence engine from __ip_vs_pe_getbyname()
but forgets to put it. Problem occurs in backup for
sync protocol v1 (2.6.39).

Also, pe_data usually comes in sync messages for
connection templates and ip_vs_conn_new() copies
the pointer only in this case. Make sure pe_data
is not leaked if it comes unexpectedly for normal
connections. Leak can happen only if bogus messages
are sent to backup server.

Fixes: fe5e7a1efb66 ("IPVS: Backup, Adding Version 1 receive capability")
Signed-off-by: Julian Anastasov <ja at ssi.bg>
Signed-off-by: Simon Horman <horms at verge.net.au>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 net/netfilter/ipvs/ip_vs_sync.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
index db801263ee9f..a8027e73b6a2 100644
--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -891,6 +891,8 @@ static void ip_vs_proc_conn(struct net *net, struct ip_vs_conn_param *param,
 			IP_VS_DBG(2, "BACKUP, add new conn. failed\n");
 			return;
 		}
+		if (!(flags & IP_VS_CONN_F_TEMPLATE))
+			kfree(param->pe_data);
 	}
 
 	if (opt)
@@ -1164,6 +1166,7 @@ static inline int ip_vs_proc_sync_conn(struct net *net, __u8 *p, __u8 *msg_end)
 				(opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
 				);
 #endif
+	ip_vs_pe_put(param.pe);
 	return 0;
 	/* Error exit */
 out: