linux-kernel - Re: [Outreachy kernel] [PATCH] Staging: ccree: Use kcalloc instead of kzalloc

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Message-ID: <alpine.DEB.2.20.1709141431050.3185@hadrien>
Date:   Thu, 14 Sep 2017 14:31:47 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Srishti Sharma <srishtishar@...il.com>
cc:     gilad@...yossef.com, gregkh@...uxfoundation.org,
        linux-crypto@...r.kernel.org,
        driverdev-devel@...uxdriverproject.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH] Staging: ccree: Use kcalloc instead
 of kzalloc



On Thu, 14 Sep 2017, Srishti Sharma wrote:

> Use kcalloc instead of kzalloc to check for overflow before
> multiplication. Done using the following semantic patch by
> coccinelle.
>
> http://coccinelle.lip6.fr/rules/kzalloc.cocci
>
> Signed-off-by: Srishti Sharma <srishtishar@...il.com>
> ---
>  drivers/staging/ccree/ssi_sysfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/ccree/ssi_sysfs.c b/drivers/staging/ccree/ssi_sysfs.c
> index 0655658..65a0529 100644
> --- a/drivers/staging/ccree/ssi_sysfs.c
> +++ b/drivers/staging/ccree/ssi_sysfs.c
> @@ -376,7 +376,7 @@ static int sys_init_dir(struct sys_dir *sys_dir, struct ssi_drvdata *drvdata,
>  		return -ENOMEM;
>  	/* allocate memory for directory's attributes list */
>  	sys_dir->sys_dir_attr_list =
> -		kzalloc(sizeof(struct attribute *) * (num_of_attrs + 1),
> +		kcalloc((num_of_attrs + 1), sizeof(struct attribute *),

You don't need the parentheses around the first argument.

julia

>  			GFP_KERNEL);
>
>  	if (!(sys_dir->sys_dir_attr_list)) {
> --
> 2.7.4
>
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