linux-kernel - [PATCH] ISDN: hysdn, fix potential NULL dereference

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Message-Id: <1277206896-27197-1-git-send-email-jslaby@suse.cz>
Date:	Tue, 22 Jun 2010 13:41:36 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	isdn@...ux-pingi.de
Cc:	linux-kernel@...r.kernel.org, jirislaby@...il.com,
	Jiri Slaby <jslaby@...e.cz>,
	"David S. Miller" <davem@...emloft.net>,
	Stephen Hemminger <shemminger@...tta.com>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org
Subject: [PATCH] ISDN: hysdn, fix potential NULL dereference

Stanse found that lp is dereferenced earlier than checked for being
NULL in hysdn_rx_netpkt. Move the initialization below the test.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Karsten Keil <isdn@...ux-pingi.de>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Stephen Hemminger <shemminger@...tta.com>
Cc: Patrick McHardy <kaber@...sh.net>
Cc: netdev@...r.kernel.org
---
 drivers/isdn/hysdn/hysdn_net.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/isdn/hysdn/hysdn_net.c b/drivers/isdn/hysdn/hysdn_net.c
index 72eb926..feec8d8 100644
--- a/drivers/isdn/hysdn/hysdn_net.c
+++ b/drivers/isdn/hysdn/hysdn_net.c
@@ -187,12 +187,13 @@ void
 hysdn_rx_netpkt(hysdn_card * card, unsigned char *buf, unsigned short len)
 {
 	struct net_local *lp = card->netif;
-	struct net_device *dev = lp->dev;
+	struct net_device *dev;
 	struct sk_buff *skb;
 
 	if (!lp)
 		return;		/* non existing device */
 
+	dev = lp->dev;
 	dev->stats.rx_bytes += len;
 
 	skb = dev_alloc_skb(len);
-- 
1.7.1


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