[PATCH 3.2 096/221] ipvs: add missing ip_vs_pe_put in sync code

Ben Hutchings
2015-05-05T01:35:30Z

From: Julian Anastasov <ja@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@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
net/netfilter/ipvs/ip_vs_sync.c | 3 +++
1 file changed, 3 insertions(+)

--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -763,6 +763,8 @@ static void ip_vs_proc_conn(struct net *
IP_VS_DBG(2, "BACKUP, add new conn. failed\n");
return;
}
+ if (!(flags & IP_VS_CONN_F_TEMPLATE))
+ kfree(param->pe_data);
} else if (!cp->dest) {
dest = ip_vs_try_bind_dest(cp);
if (dest)
@@ -1064,6 +1066,7 @@ static inline int ip_vs_proc_sync_conn(s
(opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
);
#endif
+ ip_vs_pe_put(param.pe);
return 0;
/* Error exit */