netdev - Re: question about drivers/net/cpmac.c

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Date:	Sun, 13 Dec 2009 12:00:11 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	David Miller <davem@...emloft.net>
Cc:	florian@...nwrt.org, netdev@...r.kernel.org
Subject: Re: question about drivers/net/cpmac.c

On Sun, 13 Dec 2009, David Miller wrote:

> From: Julia Lawall <julia@...u.dk>
> Date: Sun, 13 Dec 2009 11:22:54 +0100 (CET)
> 
> > The function __devinit cpmac_probe in the file drivers/net/cpmac.c 
> > contains the following code:
> > 
> > memcpy(dev->dev_addr, pdata->dev_addr, sizeof(dev->dev_addr));
> > 
> > Is it correct that the size of the pointer is what is wanted?
> 
> Everything that does sizeof(netdev->dev_addr) is a bug.
> 
> At some point we changed netdev->dev_addr from an array of chars to a
> pointer to a dynamically allocated buffer.
> 
> So these cases worked before that change and need to be updated
> in order to be correct.
> 
> Looking quickly there are a couple of these things under
> drivers/net

Fixed how?  I looked a bit to find where the field was initialized, but it 
is just initialized to a field of something else, so it was not so 
clear what the size should be.

I found the following elsewhere:

memcmp(eth->h_dest, dev->dev_addr, dev->addr_len)

Could these cases be changed to use the addr_len field? On the other hand, 
only rtl8150.c contains any mention of the addr_len field.

        memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
	dbg("%s: Setting MAC address to ", netdev->name);
        for (i = 0; i < 5; i++)
                dbg("%02X:", netdev->dev_addr[i]);
        dbg("%02X\n", netdev->dev_addr[i]);
        /* Set the IDR registers. */
        set_registers(dev, IDR, sizeof(netdev->dev_addr), netdev->dev_addr);


julia
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