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From: Stephen Rothwell <sfr@canb.auug.org.au>
To: Greg KH <greg@kroah.com>
Cc: Anant Thazhemadam <anant.thazhemadam@gmail.com>,
	petkan@nucleusys.com, davem@davemloft.net, kuba@kernel.org,
	linux-usb@vger.kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-kernel-mentees@lists.linuxfoundation.org,
	linux-next@vger.kernel.org, Jakub Kicinski <kuba@kernel.org>
Subject: Re: [PATCH v2] net: usb: rtl8150: don't incorrectly assign random MAC addresses
Date: Mon, 12 Oct 2020 09:14:28 +1100	[thread overview]
Message-ID: <20201012091428.103fc2be@canb.auug.org.au> (raw)
In-Reply-To: <20201011173030.141582-1-anant.thazhemadam@gmail.com>

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Hi Greg,

On Sun, 11 Oct 2020 23:00:30 +0530 Anant Thazhemadam <anant.thazhemadam@gmail.com> wrote:
>
> In set_ethernet_addr(), if get_registers() succeeds, the ethernet address
> that was read must be copied over. Otherwise, a random ethernet address
> must be assigned.
> 
> get_registers() returns 0 if successful, and negative error number
> otherwise. However, in set_ethernet_addr(), this return value is
> incorrectly checked.
> 
> Since this return value will never be equal to sizeof(node_id), a
> random MAC address will always be generated and assigned to the
> device; even in cases when get_registers() is successful.
> 
> Correctly modifying the condition that checks if get_registers() was
> successful or not fixes this problem, and copies the ethernet address
> appropriately.
> 
> Fixes: f45a4248ea4c ("net: usb: rtl8150: set random MAC address when set_ethernet_addr() fails")
> Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
> ---
> Changes in v2:
>         * Fixed the format of the Fixes tag
>         * Modified the commit message to better describe the issue being 
>           fixed
> 
> +CCing Stephen and linux-next, since the commit fixed isn't in the networking
> tree, but is present in linux-next.
> 
>  drivers/net/usb/rtl8150.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/usb/rtl8150.c b/drivers/net/usb/rtl8150.c
> index f020401adf04..bf8a60533f3e 100644
> --- a/drivers/net/usb/rtl8150.c
> +++ b/drivers/net/usb/rtl8150.c
> @@ -261,7 +261,7 @@ static void set_ethernet_addr(rtl8150_t *dev)
>  
>  	ret = get_registers(dev, IDR, sizeof(node_id), node_id);
>  
> -	if (ret == sizeof(node_id)) {
> +	if (!ret) {
>  		ether_addr_copy(dev->netdev->dev_addr, node_id);
>  	} else {
>  		eth_hw_addr_random(dev->netdev);
> -- 
> 2.25.1
> 

I will apply the above patch to the merge of the usb tree today to fix
up a semantic conflict between the usb tree and Linus' tree.

-- 
Cheers,
Stephen Rothwell

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  parent reply	other threads:[~2020-10-11 22:14 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-10  6:44 [PATCH] net: usb: rtl8150: don't incorrectly assign random MAC addresses Anant Thazhemadam
2020-10-10 16:59 ` Jakub Kicinski
2020-10-10 18:04   ` Anant Thazhemadam
2020-10-10 18:16     ` Jakub Kicinski
2020-10-10 18:44       ` Anant Thazhemadam
2020-10-10 19:20         ` Jakub Kicinski
2020-10-11 17:30 ` [PATCH v2] " Anant Thazhemadam
2020-10-11 17:59   ` Jakub Kicinski
2020-10-11 18:33     ` Joe Perches
2020-10-11 19:31       ` Petko Manolov
2020-10-11 20:14         ` Joe Perches
2020-10-11 22:14   ` Stephen Rothwell [this message]
2020-10-15 21:59     ` Stephen Rothwell
2020-10-15 22:24       ` Jakub Kicinski
2020-10-15 22:37         ` Jakub Kicinski
2020-10-18 19:54           ` Jakub Kicinski

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