linux-kernel - Re: [PATCH] rhashtable: use struct

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Message-Id: <20190412.173354.845771057543608824.davem@davemloft.net>
Date:   Fri, 12 Apr 2019 17:33:54 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     gustavo@...eddedor.com
Cc:     tgraf@...g.ch, herbert@...dor.apana.org.au, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rhashtable: use struct_size() in kvzalloc()

From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Date: Thu, 11 Apr 2019 18:43:06 -0500

> 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;
>     struct boo entry[];
> };
> 
> size = sizeof(struct foo) + count * sizeof(struct boo);
> instance = kvzalloc(size, GFP_KERNEL);
> 
> Instead of leaving these open-coded and prone to type mistakes, we can
> now use the new struct_size() helper:
> 
> instance = kvzalloc(struct_size(instance, entry, count), GFP_KERNEL);
> 
> This code was detected with the help of Coccinelle.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Applied.