linux-kernel - Re: [PATCH] rt2x00: Use kcalloc instead of kzalloc to allocate array

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Message-ID: <CAOZOX0UU7Jcd1XbV-bM4OBCwwySNyVOwQ_u2yhwyigfUgx=eBA@mail.gmail.com>
Date:	Sat, 3 Dec 2011 12:46:15 +0100
From:	Ivo Van Doorn <ivdoorn@...il.com>
To:	Thomas Meyer <thomas@...3r.de>
Cc:	gwingerde@...il.com, helmut.schaa@...glemail.com,
	linville@...driver.com, linux-wireless@...r.kernel.org,
	users@...x00.serialmonkey.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rt2x00: Use kcalloc instead of kzalloc to allocate array

On Tue, Nov 29, 2011 at 10:08 PM, Thomas Meyer <thomas@...3r.de> wrote:
> The advantage of kcalloc is, that will prevent integer overflows which could
> result from the multiplication of number of elements and size and it is also
> a bit nicer to read.
>
> The semantic patch that makes this change is available
> in https://lkml.org/lkml/2011/11/25/107
>
> Signed-off-by: Thomas Meyer <thomas@...3r.de>

Acked-by: Ivo van Doorn <IvDoorn@...il.com>

> ---
>
> diff -u -p a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
> --- a/drivers/net/wireless/rt2x00/rt2x00dev.c 2011-11-28 19:36:47.770108588 +0100
> +++ b/drivers/net/wireless/rt2x00/rt2x00dev.c 2011-11-28 19:54:53.495525543 +0100
> @@ -831,11 +831,11 @@ static int rt2x00lib_probe_hw_modes(stru
>        if (spec->supported_rates & SUPPORT_RATE_OFDM)
>                num_rates += 8;
>
> -       channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
> +       channels = kcalloc(spec->num_channels, sizeof(*channels), GFP_KERNEL);
>        if (!channels)
>                return -ENOMEM;
>
> -       rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
> +       rates = kcalloc(num_rates, sizeof(*rates), GFP_KERNEL);
>        if (!rates)
>                goto exit_free_channels;
>
--
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