linux-kernel - [PATCH 3/4] ISDN: hysdn: avoid NULL pointer dereference

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Date:	Thu,  7 Jan 2010 04:48:40 +0300
From:	Alexander Beregalov <a.beregalov@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alexander Beregalov <a.beregalov@...il.com>,
	Armin Schindler <mac@...ware.de>
Subject: [PATCH 3/4] ISDN: hysdn: avoid NULL pointer dereference

Assign dev only if lp is not NULL.

Cc: Armin Schindler <mac@...ware.de>
Signed-off-by: Alexander Beregalov <a.beregalov@...il.com>
---
 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);
-- 
1.6.6

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