[PATCH 3/4] ISDN: hysdn: avoid NULL pointer dereference
From: Alexander Beregalov
Date: Wed Jan 06 2010 - 20:49:26 EST
Assign dev only if lp is not NULL.
Cc: Armin Schindler <mac@xxxxxxxxxx>
Signed-off-by: Alexander Beregalov <a.beregalov@xxxxxxxxx>
---
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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