Subject: Re: [PATCH 3/3] netfilter: xt_CT: remove a compile warning

From: Pablo Neira Ayuso <[email-masked]>
Date: Tue, 3 Apr 2012 14:57:55 +0200

On Tue, Apr 03, 2012 at 09:28:38PM +0900, Tetsuo Handa wrote:
> Pablo Neira Ayuso wrote:
> > Indeed. The patch attached should fix this problem. Thanks.
> 
> It seems to me that the timeout object is associated with the "ct"
> by successful nf_ct_timeout_ext_add() call. If yes,
> 
>  +err5:
>  +	xt_ct_tg_timeout_put(ct);
> 
> will not be able to find the timeout object.

You're right again. New patch attached.
>>From 6b9599e7a092a241e86e376d14bb1b45902f19b5 Mon Sep 17 00:00:00 2001
From: Pablo Neira Ayuso <[email-masked]>
Date: Tue, 3 Apr 2012 14:50:07 +0200
Subject: [PATCH] netfilter: xt_CT: fix missing put timeout object in error path

The error path misses putting the timeout object. This patch adds
new function xt_ct_tg_timeout_put() to put the timeout object.

Reported-by: Tetsuo Handa <[email-masked]>
Signed-off-by: Pablo Neira Ayuso <[email-masked]>
---
 net/netfilter/xt_CT.c |   28 +++++++++++++++++++++++-----
 1 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/net/netfilter/xt_CT.c b/net/netfilter/xt_CT.c
index 4babb27..e2ee11a 100644
--- a/net/netfilter/xt_CT.c
+++ b/net/netfilter/xt_CT.c
@@ -150,6 +150,21 @@ err1:
 	return ret;
 }
 
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+static inline void xt_ct_tg_timeout_put(struct ctnl_timeout *timeout)
+{
+	typeof(nf_ct_timeout_put_hook) timeout_put;
+
+	rcu_read_lock();
+	timeout_put = rcu_dereference(nf_ct_timeout_put_hook);
+
+	if (timeout_put)
+		timeout_put(timeout);
+
+	rcu_read_unlock();
+}
+#endif
+
 static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
 {
 	struct xt_ct_target_info_v1 *info = par->targinfo;
@@ -158,7 +173,9 @@ static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
 	struct nf_conn *ct;
 	int ret = 0;
 	u8 proto;
-
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+	struct ctnl_timeout *timeout;
+#endif
 	if (info->flags & ~XT_CT_NOTRACK)
 		return -EINVAL;
 
@@ -216,7 +233,6 @@ static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
 	if (info->timeout) {
 		typeof(nf_ct_timeout_find_get_hook) timeout_find_get;
-		struct ctnl_timeout *timeout;
 		struct nf_conn_timeout *timeout_ext;
 
 		rcu_read_lock();
@@ -245,7 +261,7 @@ static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
 				pr_info("Timeout policy `%s' can only be "
 					"used by L3 protocol number %d\n",
 					info->timeout, timeout->l3num);
-				goto err4;
+				goto err5;
 			}
 			/* Make sure the timeout policy matches any existing
 			 * protocol tracker, otherwise default to generic.
@@ -258,13 +274,13 @@ static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
 					"used by L4 protocol number %d\n",
 					info->timeout,
 					timeout->l4proto->l4proto);
-				goto err4;
+				goto err5;
 			}
 			timeout_ext = nf_ct_timeout_ext_add(ct, timeout,
 							    GFP_ATOMIC);
 			if (timeout_ext == NULL) {
 				ret = -ENOMEM;
-				goto err4;
+				goto err5;
 			}
 		} else {
 			ret = -ENOENT;
@@ -282,6 +298,8 @@ out:
 	return 0;
 
 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+err5:
+	xt_ct_tg_timeout_put(timeout);
 err4:
 	rcu_read_unlock();
 #endif
-- 
1.7.2.5