linux-kernel - [PATCH 1/1] NET: ipv6, remove unnecessary check

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Date:	Sun, 10 Jan 2010 11:43:03 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	davem@...emloft.net
Cc:	adobriyan@...il.com, linux-kernel@...r.kernel.org,
	jirislaby@...il.com, Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org
Subject: [PATCH 1/1] NET: ipv6, remove unnecessary check

Stanse found a potential null dereference in snmp6_unregister_dev.
There is a check for idev being NULL, but it is dereferenced
earlier. But idev cannot be NULL when passed to
snmp6_unregister_dev, so remove the test.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru>
Cc: "Pekka Savola (ipv6)" <pekkas@...core.fi>
Cc: James Morris <jmorris@...ei.org>
Cc: Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Cc: Patrick McHardy <kaber@...sh.net>
Cc: netdev@...r.kernel.org
---
 net/ipv6/proc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/ipv6/proc.c b/net/ipv6/proc.c
index c9605c3..7b197b7 100644
--- a/net/ipv6/proc.c
+++ b/net/ipv6/proc.c
@@ -259,7 +259,7 @@ int snmp6_unregister_dev(struct inet6_dev *idev)
 	struct net *net = dev_net(idev->dev);
 	if (!net->mib.proc_net_devsnmp6)
 		return -ENOENT;
-	if (!idev || !idev->stats.proc_dir_entry)
+	if (!idev->stats.proc_dir_entry)
 		return -EINVAL;
 	remove_proc_entry(idev->stats.proc_dir_entry->name,
 			  net->mib.proc_net_devsnmp6);
-- 
1.6.5.7

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