From: Lee Jones <lee.jones@linaro.org>
To: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Cc: Linus Walleij <linus.walleij@linaro.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] mfd: sm501: Use struct_size() in devm_kzalloc()
Date: Wed, 30 Jan 2019 13:35:39 +0000 [thread overview]
Message-ID: <20190130133539.GH4701@dell> (raw)
In-Reply-To: <4e25a7933cc9876b24fa3322637a22df7475bc40.1548175934.git.gustavo@embeddedor.com>
On Tue, 22 Jan 2019, 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;
> struct boo entry[];
> };
>
> instance = devm_kzalloc(dev, sizeof(struct foo) + count * sizeof(struct boo), GFP_KERNEL);
>
> Instead of leaving these open-coded and prone to type mistakes, we can
> now use the new struct_size() helper:
>
> instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);
>
> This code was detected with the help of Coccinelle.
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
> ---
> drivers/mfd/sm501.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
Applied, thanks.
--
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
next prev parent reply other threads:[~2019-01-30 13:35 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-22 16:55 [PATCH 0/2] Fix NULL pointer dereference and use struct_size() Gustavo A. R. Silva
2019-01-22 16:56 ` [PATCH 1/2] mfd: sm501: Fix potential NULL pointer dereference Gustavo A. R. Silva
2019-01-30 13:35 ` Lee Jones
2019-01-31 0:16 ` Gustavo A. R. Silva
2019-01-22 16:58 ` [PATCH 2/2] mfd: sm501: Use struct_size() in devm_kzalloc() Gustavo A. R. Silva
2019-01-30 13:35 ` Lee Jones [this message]
2019-01-26 13:20 ` [PATCH 0/2] Fix NULL pointer dereference and use struct_size() Linus Walleij
2019-01-26 13:49 ` Gustavo A. R. Silva
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