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

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Message-ID: <4B3257C2.2050500@gmail.com>
Date:	Wed, 23 Dec 2009 18:47:46 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Dan Carpenter <error27@...il.com>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch] hamradio: avoid null deref

Dan Carpenter wrote, On 12/23/2009 02:25 PM:

> If dev == NULL we shouldn't dereference it.
> 
> 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	2009-12-22 23:59:46.000000000 +0200
> @@ -283,7 +283,6 @@ static netdev_tx_t bpq_xmit(struct sk_bu
>  	bpq = netdev_priv(dev);
>  
>  	if ((dev = bpq_get_ether_dev(dev)) == NULL) {
> -		dev->stats.tx_dropped++;

Why not use a separate variable for another dev? This stat
should be helpful for debugging.

Jarek P.

>  		kfree_skb(skb);
>  		return NETDEV_TX_OK;
>  	}


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