netdev - [PATCH][IPVS] Don't leak sysctl tables if the scheduler registration fails

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Message-ID: <4753D4C5.4040301@openvz.org>
Date:	Mon, 03 Dec 2007 13:04:53 +0300
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	Herbert Xu <herbert@...dor.apana.org.au>,
	David Miller <davem@...emloft.net>
CC:	Linux Netdev List <netdev@...r.kernel.org>, devel@...nvz.org,
	Wensong Zhang <wensong@...ux-vs.org>,
	Simon Horman <horms@...ge.net.au>, Julian Anastasov <ja@....bg>
Subject: [PATCH][IPVS] Don't leak sysctl tables if the scheduler registration
 fails

In case we load lblc or lblcr module we can leak some sysctl
tables if the call to register_ip_vs_scheduler() fails.

I've looked at the register_ip_vs_scheduler() code and saw, that
the only reason to fail is the name collision, so I think that
with some 3rd party schedulers this becomes a relevant issue. No?

Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>

---

diff --git a/net/ipv4/ipvs/ip_vs_lblc.c b/net/ipv4/ipvs/ip_vs_lblc.c
index b843a11..ad89644 100644
--- a/net/ipv4/ipvs/ip_vs_lblc.c
+++ b/net/ipv4/ipvs/ip_vs_lblc.c
@@ -580,9 +580,14 @@ static struct ip_vs_scheduler ip_vs_lblc_scheduler =
 
 static int __init ip_vs_lblc_init(void)
 {
+	int ret;
+
 	INIT_LIST_HEAD(&ip_vs_lblc_scheduler.n_list);
 	sysctl_header = register_sysctl_table(lblc_root_table);
-	return register_ip_vs_scheduler(&ip_vs_lblc_scheduler);
+	ret = register_ip_vs_scheduler(&ip_vs_lblc_scheduler);
+	if (ret)
+		unregister_sysctl_table(sysctl_header);
+	return ret;
 }
 
 
diff --git a/net/ipv4/ipvs/ip_vs_lblcr.c b/net/ipv4/ipvs/ip_vs_lblcr.c
index e5b323a..2a5ed85 100644
--- a/net/ipv4/ipvs/ip_vs_lblcr.c
+++ b/net/ipv4/ipvs/ip_vs_lblcr.c
@@ -769,9 +769,14 @@ static struct ip_vs_scheduler ip_vs_lblcr_scheduler =
 
 static int __init ip_vs_lblcr_init(void)
 {
+	int ret;
+
 	INIT_LIST_HEAD(&ip_vs_lblcr_scheduler.n_list);
 	sysctl_header = register_sysctl_table(lblcr_root_table);
-	return register_ip_vs_scheduler(&ip_vs_lblcr_scheduler);
+	ret = register_ip_vs_scheduler(&ip_vs_lblcr_scheduler);
+	if (ret)
+		unregister_sysctl_table(sysctl_header);
+	return ret;
 }
 
 
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