linux-kernel - [patch] hamradio: avoid null deref v3

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Message-ID: <20091228165455.GA17645@bicker>
Date:	Mon, 28 Dec 2009 18:54:55 +0200
From:	Dan Carpenter <error27@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	jarkao2@...il.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [patch] hamradio: avoid null deref v3

This should address the problems in version 1 (lazy) and version 2 (ugly).

Bump the stats on orig_dev not on the newly assigned NULL dev variable.

Signed-off-by: Dan Carpenter <error27@...il.com>

--- orig/drivers/net/hamradio/bpqether.c	2009-12-22 23:58:56.000000000 +0200
+++ devel/drivers/net/hamradio/bpqether.c	2009-12-28 00:12:48.000000000 +0200
@@ -248,6 +248,7 @@ static netdev_tx_t bpq_xmit(struct sk_bu
 {
 	unsigned char *ptr;
 	struct bpqdev *bpq;
+	struct net_device *orig_dev;
 	int size;
 
 	/*
@@ -282,8 +283,9 @@ static netdev_tx_t bpq_xmit(struct sk_bu
 
 	bpq = netdev_priv(dev);
 
+	orig_dev = dev;
 	if ((dev = bpq_get_ether_dev(dev)) == NULL) {
-		dev->stats.tx_dropped++;
+		orig_dev->stats.tx_dropped++;
 		kfree_skb(skb);
 		return NETDEV_TX_OK;
 	}
--
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