linux-kernel - Re: [PATCH 4/6] drivers/net/fs_enet: remove null pointer dereference

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Message-ID: <48287CE4.9050304@freescale.com>
Date:	Mon, 12 May 2008 12:22:44 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Francois Romieu <romieu@...zoreil.com>
CC:	Julia Lawall <julia@...u.dk>, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, vbordug@...mvista.com, jgarzik@...ox.com
Subject: Re: [PATCH 4/6] drivers/net/fs_enet: remove null pointer dereference

Francois Romieu wrote:
> Julia Lawall <julia@...u.dk> :
> [...]
>> diff -u -p a/drivers/net/fs_enet/fs_enet-main.c b/drivers/net/fs_enet/fs_enet-main.c
>> --- a/drivers/net/fs_enet/fs_enet-main.c	2008-04-27 11:41:11.000000000 +0200
>> +++ b/drivers/net/fs_enet/fs_enet-main.c	2008-05-12 09:41:52.000000000 +0200
>> @@ -1093,7 +1093,7 @@ err:
>>  		if (registered)
>>  			unregister_netdev(ndev);
>>  
>> -		if (fep != NULL) {
>> +		if (fep && fep->ops) {
>>  			(*fep->ops->free_bd)(ndev);
>>  			(*fep->ops->cleanup_data)(ndev);
>>  		}
> 
> Extra cookies for the nice soul who:
> - removes the 'if (registered)' test (it can not happen)
> - uses different error lablels and unrolls the error path. I can not claim
>   that the current error path is wrong but it would not hurt if it was more
>   trivially balanced.
> 

Please note that this code is going away very soon, when arch/ppc dies.

-Scott
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