netdev - [PATCH] net: reference the ipv4 sysctl table header

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Message-ID: <20120326222359.GB28123@dztty>
Date:	Mon, 26 Mar 2012 23:23:59 +0100
From:	Djalal Harouni <tixxdz@...ndz.org>
To:	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Al Viro <viro@...iv.linux.org.uk>
Cc:	netdev@...r.kernel.org
Subject: [PATCH] net: reference the ipv4 sysctl table header

I've been analysing some kmemleak reports of an internal module, and
found that there are false positive reports of unreferenced objects.

The following patch is just a clean up for one of those false positives,
this is for the /proc/sys/net/ipv4 sysctl table.
As I've said there are other reports but don't know if it is worth to
write patches for them.


---
From: Djalal Harouni <tixxdz@...ndz.org>
Subject: [PATCH] net: reference the ipv4 sysctl table header

Reference the ipv4 sysctl table header allocated and returned by
register_sysctl_paths().

Signed-off-by: Djalal Harouni <tixxdz@...ndz.org>
---
 include/net/ip.h   |    2 +-
 net/ipv4/af_inet.c |   12 ++++++++++--
 net/ipv4/route.c   |   10 ++++++++--
 3 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/include/net/ip.h b/include/net/ip.h
index b53d65f..6a12687 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -235,7 +235,7 @@ extern int sysctl_ip_dynaddr;
 
 extern void ipfrag_init(void);
 
-extern void ip_static_sysctl_init(void);
+extern int ip_static_sysctl_init(void);
 
 static inline bool ip_is_fragment(const struct iphdr *iph)
 {
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index fdf49fd..340d298 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1666,10 +1666,14 @@ static int __init inet_init(void)
 	 *	Tell SOCKET that we are alive...
 	 */
 
-	(void)sock_register(&inet_family_ops);
+	rc = sock_register(&inet_family_ops);
+	if (rc)
+		goto out_unregister_ping_prot;
 
 #ifdef CONFIG_SYSCTL
-	ip_static_sysctl_init();
+	rc = ip_static_sysctl_init();
+	if (rc)
+		goto out_unregister_sock;
 #endif
 
 	tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
@@ -1751,6 +1755,10 @@ static int __init inet_init(void)
 	rc = 0;
 out:
 	return rc;
+out_unregister_sock:
+	sock_unregister(PF_INET);
+out_unregister_ping_prot:
+	proto_unregister(&ping_prot);
 out_unregister_raw_proto:
 	proto_unregister(&raw_prot);
 out_unregister_udp_proto:
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 12ccf88..bc899f2 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -3500,12 +3500,18 @@ int __init ip_rt_init(void)
 }
 
 #ifdef CONFIG_SYSCTL
+static struct ctl_table_header *ip4_base;
+
 /*
  * We really need to sanitize the damn ipv4 init order, then all
  * this nonsense will go away.
  */
-void __init ip_static_sysctl_init(void)
+int __init ip_static_sysctl_init(void)
 {
-	register_sysctl_paths(ipv4_path, ipv4_skeleton);
+	ip4_base = register_sysctl_paths(ipv4_path, ipv4_skeleton);
+	if (!ip4_base)
+		return -ENOMEM;
+
+	return 0;
 }
 #endif
-- 
1.7.1
--
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