linux-kernel - Re: [PATCH net-next] can: kvaser_usb: Use struct_size() in alloc

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Message-ID: <524a265c-21fb-72e1-e077-dd51d8807751@embeddedor.com>
Date:   Wed, 1 May 2019 12:42:03 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] can: kvaser_usb: Use struct_size() in
 alloc_candev()

Hi all,

Friendly ping(second one):

Who can take this?

Thanks
--
Gustavo

On 2/25/19 6:48 PM, Gustavo A. R. Silva wrote:
> Hi all,
> 
> Friendly ping:
> 
> Who can take this?
> 
> Thanks
> --
> Gustavo
> 
> On 2/7/19 9:10 PM, Gustavo A. R. Silva wrote:
>> One of the more common cases of allocation size calculations is finding
>> the size of a structure that has a zero-sized array at the end, along
>> with memory for some number of elements for that array. For example:
>>
>> struct foo {
>>     int stuff;
>>     void *entry[];
>> };
>>
>> instance = alloc(sizeof(struct foo) + count * sizeof(void *));
>>
>> Instead of leaving these open-coded and prone to type mistakes, we can
>> now use the new struct_size() helper:
>>
>> instance = alloc(struct_size(instance, entry, count));
>>
>> This code was detected with the help of Coccinelle.
>>
>> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
>> ---
>>  drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c | 3 +--
>>  1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
>> index c89c7d4900d7..0f1d3e807d63 100644
>> --- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
>> +++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
>> @@ -643,8 +643,7 @@ static int kvaser_usb_init_one(struct kvaser_usb *dev,
>>  			return err;
>>  	}
>>  
>> -	netdev = alloc_candev(sizeof(*priv) +
>> -			      dev->max_tx_urbs * sizeof(*priv->tx_contexts),
>> +	netdev = alloc_candev(struct_size(priv, tx_contexts, dev->max_tx_urbs),
>>  			      dev->max_tx_urbs);
>>  	if (!netdev) {
>>  		dev_err(&dev->intf->dev, "Cannot alloc candev\n");
>>