linux-kernel - [PATCH 1/2] nfc: fix NULL pointer dereference

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Message-ID: <20540404.Au0OUqzobS@daeseok-laptop.cloud.net>
Date:	Wed, 02 Apr 2014 16:55:30 +0900
From:	Daeseok Youn <daeseok.youn@...il.com>
To:	davem@...emloft.net, lauro.venancio@...nbossa.org
Cc:	aloisio.almeida@...nbossa.org, sameo@...ux.intel.com,
	linux-wireless@...r.kernel.org, linux-nfc@...ts.01.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] nfc: fix NULL pointer dereference


dev is NULL when nfc_get_device() is failed but
dev is used for handling error.

coccicheck says:
 net/nfc/netlink.c:1092:21-24: ERROR:
dev is NULL but dereferenced.

Signed-off-by: Daeseok Youn <daeseok.youn@...il.com>
---
 net/nfc/netlink.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 43cb1c1..b2ad570 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -1026,10 +1026,8 @@ static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
 	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
 	dev = nfc_get_device(idx);
-	if (!dev) {
-		rc = -ENODEV;
-		goto exit;
-	}
+	if (!dev)
+		return -ENODEV;
 
 	device_lock(&dev->dev);
 
-- 
1.7.4.4


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