linux-kernel - Re: [PATCH 2/2] um: vector: Use 'kmalloc

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Date:   Tue, 8 Jan 2019 15:58:14 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>,
        anton.ivanov@...bridgegreys.com,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        YueHaibing <yuehaibing@...wei.com>, linux-um@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 2/2] um: vector: Use 'kmalloc_array' instead of 'kmalloc'

On Fri, Dec 28, 2018 at 1:57 AM Christophe JAILLET
<christophe.jaillet@...adoo.fr> wrote:
>
> Use 'kmalloc_array' instead of 'kmalloc' when appropriate.
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Reviewed-by: Kees Cook <keescook@...omium.org>

Richard, can you take these?

> ---
> I don't know why it has not already been replaced in 6da2ec56059c
> ("treewide: kmalloc() -> kmalloc_array()".

Hm, not sure. I'd guess it was from the ()s and some Coccinelle rule
missing handling that. I thought I caught them all. :P

> ---
>  arch/um/drivers/vector_kern.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/um/drivers/vector_kern.c b/arch/um/drivers/vector_kern.c
> index 5b917716289d..dee5246bda81 100644
> --- a/arch/um/drivers/vector_kern.c
> +++ b/arch/um/drivers/vector_kern.c
> @@ -507,12 +507,12 @@ static struct vector_queue *create_queue(
>                 return NULL;
>         result->max_depth = max_size;
>         result->dev = vp->dev;
> -       result->mmsg_vector = kmalloc(
> -               (sizeof(struct mmsghdr) * max_size), GFP_KERNEL);
> +       result->mmsg_vector = kmalloc_array(max_size, sizeof(struct mmsghdr),
> +                                           GFP_KERNEL);
>         if (result->mmsg_vector == NULL)
>                 goto out_mmsg_fail;
> -       result->skbuff_vector = kmalloc(
> -               (sizeof(void *) * max_size), GFP_KERNEL);
> +       result->skbuff_vector = kmalloc_array(max_size, sizeof(void *),
> +                                             GFP_KERNEL);
>         if (result->skbuff_vector == NULL)
>                 goto out_skb_fail;
>
> --
> 2.19.1
>


-- 
Kees Cook