linux-kernel - [122/127] act_nat: use stack variable

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Date:	Tue, 07 Dec 2010 16:45:08 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Changli Gao <xiaosuo@...il.com>,
	dann frazier <dannf@...ian.org>
Subject: [122/127] act_nat: use stack variable

2.6.32-stable review patch.  If anyone has any objections, please let us know.

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

From: Changli Gao <xiaosuo@...il.com>

commit 504f85c9d05f7c605306e808f0d835fe11bfd18d upstream.

act_nat: use stack variable

structure tc_nat isn't too big for stack, so we can put it in stack.

Signed-off-by: Changli Gao <xiaosuo@...il.com>
Cc: dann frazier <dannf@...ian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/sched/act_nat.c |   33 +++++++++++----------------------
 1 file changed, 11 insertions(+), 22 deletions(-)

--- a/net/sched/act_nat.c
+++ b/net/sched/act_nat.c
@@ -261,40 +261,29 @@ static int tcf_nat_dump(struct sk_buff *
 {
 	unsigned char *b = skb_tail_pointer(skb);
 	struct tcf_nat *p = a->priv;
-	struct tc_nat *opt;
+	struct tc_nat opt;
 	struct tcf_t t;
-	int s;
 
-	s = sizeof(*opt);
+	opt.old_addr = p->old_addr;
+	opt.new_addr = p->new_addr;
+	opt.mask = p->mask;
+	opt.flags = p->flags;
+
+	opt.index = p->tcf_index;
+	opt.action = p->tcf_action;
+	opt.refcnt = p->tcf_refcnt - ref;
+	opt.bindcnt = p->tcf_bindcnt - bind;
 
-	/* netlink spinlocks held above us - must use ATOMIC */
-	opt = kzalloc(s, GFP_ATOMIC);
-	if (unlikely(!opt))
-		return -ENOBUFS;
-
-	opt->old_addr = p->old_addr;
-	opt->new_addr = p->new_addr;
-	opt->mask = p->mask;
-	opt->flags = p->flags;
-
-	opt->index = p->tcf_index;
-	opt->action = p->tcf_action;
-	opt->refcnt = p->tcf_refcnt - ref;
-	opt->bindcnt = p->tcf_bindcnt - bind;
-
-	NLA_PUT(skb, TCA_NAT_PARMS, s, opt);
+	NLA_PUT(skb, TCA_NAT_PARMS, sizeof(opt), &opt);
 	t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install);
 	t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse);
 	t.expires = jiffies_to_clock_t(p->tcf_tm.expires);
 	NLA_PUT(skb, TCA_NAT_TM, sizeof(t), &t);
 
-	kfree(opt);
-
 	return skb->len;
 
 nla_put_failure:
 	nlmsg_trim(skb, b);
-	kfree(opt);
 	return -1;
 }
 


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