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

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Date:   Thu, 14 Sep 2017 14:30:49 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Srishti Sharma <srishtishar@...il.com>
cc:     oleg.drokin@...el.com, andreas.dilger@...el.com,
        jsimmons@...radead.org, gregkh@...uxfoundation.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH] Staging: lustre: obdclass: 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>

Acked-by: Julia Lawall <julia.lawall@...6.fr>

> ---
>  drivers/staging/lustre/lustre/obdclass/cl_object.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/lustre/lustre/obdclass/cl_object.c b/drivers/staging/lustre/lustre/obdclass/cl_object.c
> index 95c7fa3..28cb8489 100644
> --- a/drivers/staging/lustre/lustre/obdclass/cl_object.c
> +++ b/drivers/staging/lustre/lustre/obdclass/cl_object.c
> @@ -1016,7 +1016,7 @@ int cl_global_init(void)
>  {
>  	int result;
>
> -	cl_envs = kzalloc(sizeof(*cl_envs) * num_possible_cpus(), GFP_KERNEL);
> +	cl_envs = kcalloc(num_possible_cpus(), sizeof(*cl_envs), GFP_KERNEL);
>  	if (!cl_envs) {
>  		result = -ENOMEM;
>  		goto out;
> --
> 2.7.4
>
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