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

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Message-ID: <b736a7b3-819a-a471-c767-2997354e70e4@pengutronix.de>
Date:   Tue, 26 Feb 2019 08:52:15 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        "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()

On 2/8/19 4:10 AM, 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>

Applied to linux-can-next.

Tnx,
Marc

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