netdev - Re: [PATCH net-next] net: usb: cdc-phonet: use struct_size() in alloc

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Message-Id: <20190208.225808.269387328723471283.davem@davemloft.net>
Date:   Fri, 08 Feb 2019 22:58:08 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     gustavo@...eddedor.com
Cc:     linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: usb: cdc-phonet: use struct_size() in
 alloc_netdev()

From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Date: Thu, 7 Feb 2019 21:13:13 -0600

> 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.