linux-kernel - Re: [PATCH v2 1/7] net: validate MAC address directly in dev_set_mac

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Date:	Thu, 01 Mar 2012 16:21:30 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	bhutchings@...arflare.com
Cc:	danny.kukawka@...ect.de, eilong@...adcom.com, dkukawka@...e.de,
	eric.dumazet@...il.com, mirq-linux@...e.qmqm.pl, jpirko@...hat.com,
	nhorman@...driver.com, rdunlap@...otime.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/7] net: validate MAC address directly in
 dev_set_mac_address()

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Thu, 1 Mar 2012 17:51:29 +0000

> On Thu, 2012-03-01 at 17:52 +0100, Danny Kukawka wrote:
>> Validate the given MAC address directly in dev_set_mac_address()
>> if a .ndo_validate_addr function is available before calling
>> the .ndo_set_mac_address function.
>> 
>> Changed .ndo_validate_addr to take a second parameter containing
>> a sockaddr struct to be checked instead of the net_device dev_addr.
>> The behaviour of .ndo_validate_addr is now: if the second parameter
>> is NULL the net_device->dev_addr gets validate, if != NULL
>> the given parameter/sockaddr gets validated instead.
> [...]
> 
> The caller is assumed to have validated the address family, so why not
> just pass a pointer to the hardware address (u8 *), and get rid of the
> special case for NULL?
> 
> That is, dev_set_mac_address would call:
> 	ops->ndo_validate_addr(dev, sa->sa_data);
> and dev_open would call:
> 	ops->ndo_validate_addr(dev, dev->dev_addr);

Yes, this looks a lot better.
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