linux-kernel - [PATCH] net-ipv6: Delete unnecessary checks before the function call "kfree

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Date:	Sat, 14 Nov 2015 20:05:17 +0100
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Hideaki Yoshfuji <yoshfuji@...ux-ipv6.org>,
	James Morris <jmorris@...ei.org>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org
Cc:	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH] net-ipv6: Delete unnecessary checks before the function call
 "kfree_skb"

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sat, 14 Nov 2015 19:55:00 +0100

The kfree_skb() function tests whether its argument is NULL and then
returns immediately. Thus the test around the calls is not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 net/ipv6/af_inet6.c                     | 7 ++-----
 net/ipv6/netfilter/nf_conntrack_reasm.c | 3 +--
 2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 44bb66b..4cd9259 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -416,12 +416,9 @@ void inet6_destroy_sock(struct sock *sk)
 	/* Release rx options */
 
 	skb = xchg(&np->pktoptions, NULL);
-	if (skb)
-		kfree_skb(skb);
-
+	kfree_skb(skb);
 	skb = xchg(&np->rxpmtu, NULL);
-	if (skb)
-		kfree_skb(skb);
+	kfree_skb(skb);
 
 	/* Free flowlabels */
 	fl6_free_socklist(sk);
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index d5efeb8..dbc013b 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -172,8 +172,7 @@ static unsigned int nf_hashfn(const struct inet_frag_queue *q)
 
 static void nf_skb_free(struct sk_buff *skb)
 {
-	if (NFCT_FRAG6_CB(skb)->orig)
-		kfree_skb(NFCT_FRAG6_CB(skb)->orig);
+	kfree_skb(NFCT_FRAG6_CB(skb)->orig);
 }
 
 static void nf_ct_frag6_expire(unsigned long data)
-- 
2.6.2

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