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

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Date:	Sat, 3 Dec 2011 10:20:10 +0100
From:	Gertjan van Wingerde <gwingerde@...il.com>
To:	Thomas Meyer <thomas@...3r.de>
Cc:	"IvDoorn@...il.com" <IvDoorn@...il.com>,
	"helmut.schaa@...glemail.com" <helmut.schaa@...glemail.com>,
	"linville@...driver.com" <linville@...driver.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"users@...x00.serialmonkey.com" <users@...x00.serialmonkey.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rt2x00: Use kcalloc instead of kzalloc to allocate array

On 29 nov. 2011, at 22:08, 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: Gertjan van Wingerde <gwingerde@...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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