linux-kernel - Re: [PATCH 01/18] mtd-cfi_cmdset_0001: Use kmalloc_array() in cfi_intelext_partition

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Message-ID: <31f8448f-aba7-965a-e924-e1ec63eecbaf@gmail.com>
Date:   Wed, 11 Jan 2017 22:59:52 +0100
From:   Marek Vasut <marek.vasut@...il.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        linux-mtd@...ts.infradead.org,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Brian Norris <computersforpeace@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Richard Weinberger <richard@....at>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 01/18] mtd-cfi_cmdset_0001: Use kmalloc_array() in
 cfi_intelext_partition_fixup()

On 01/11/2017 09:35 PM, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Tue, 10 Jan 2017 18:48:34 +0100
> 
> * A multiplication for the size determination of a memory allocation
>   indicated that an array data structure should be processed.
>   Thus use the corresponding function "kmalloc_array".
> 
>   This issue was detected by using the Coccinelle software.
> 
> * Replace the specification of a data structure by a pointer dereference
>   to make the corresponding size determination a bit safer according to
>   the Linux coding style convention.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/mtd/chips/cfi_cmdset_0001.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/chips/cfi_cmdset_0001.c b/drivers/mtd/chips/cfi_cmdset_0001.c
> index 5e1b68cbcd0a..68227aa74d22 100644
> --- a/drivers/mtd/chips/cfi_cmdset_0001.c
> +++ b/drivers/mtd/chips/cfi_cmdset_0001.c
> @@ -746,7 +746,9 @@ static int cfi_intelext_partition_fixup(struct mtd_info *mtd,
>  		newcfi = kmalloc(sizeof(struct cfi_private) + numvirtchips * sizeof(struct flchip), GFP_KERNEL);
>  		if (!newcfi)
>  			return -ENOMEM;
> -		shared = kmalloc(sizeof(struct flchip_shared) * cfi->numchips, GFP_KERNEL);
> +		shared = kmalloc_array(cfi->numchips,
> +				       sizeof(*shared),
> +				       GFP_KERNEL);

You can keep this on a single line, no need for the linebreak. It
doesn't violate the 80-chars per line rule IMO.

>  		if (!shared) {
>  			kfree(newcfi);
>  			return -ENOMEM;
> 


-- 
Best regards,
Marek Vasut