linux-kernel - Re: [PATCH net-next] mlxsw: spectrum_acl_bloom_filter: use struct

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Message-Id: <20190116.091251.1730087614369180077.davem@davemloft.net>
Date:   Wed, 16 Jan 2019 09:12:51 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     gustavo@...eddedor.com
Cc:     jiri@...lanox.com, idosch@...lanox.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] mlxsw: spectrum_acl_bloom_filter: use
 struct_size() in kzalloc()

From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Date: Tue, 15 Jan 2019 17:05:39 -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 = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);
> 
> Instead of leaving these open-coded and prone to type mistakes, we can
> now use the new struct_size() helper:
> 
> instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);
> 
> This issue was detected with the help of Coccinelle.
> 
> Reviewed-by: Ido Schimmel <idosch@...lanox.com>
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Applied.