linux-kernel - Re: [PATCH 1/6] crypto-caamhash: Use kmalloc_array() in ahash

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Date:   Thu, 15 Sep 2016 15:12:53 +0000
From:   Horia Geanta Neag <horia.geanta@....com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Labbe Corentin <clabbe.montjoie@...il.com>,
        Russell King <rmk+kernel@....linux.org.uk>
CC:     LKML <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 1/6] crypto-caamhash: Use kmalloc_array() in
 ahash_setkey()

On 9/15/2016 5:43 PM, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Thu, 15 Sep 2016 11:20:09 +0200
> 
> * 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 type 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/crypto/caam/caamhash.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c
> index 9d7fc9e..f19df8f 100644
> --- a/drivers/crypto/caam/caamhash.c
> +++ b/drivers/crypto/caam/caamhash.c
> @@ -525,8 +525,9 @@ static int ahash_setkey(struct crypto_ahash *ahash,
>  #endif
>  
>  	if (keylen > blocksize) {
> -		hashed_key = kmalloc(sizeof(u8) * digestsize, GFP_KERNEL |
> -				     GFP_DMA);
> +		hashed_key = kmalloc_array(digestsize,
> +					   sizeof(*hashed_key),
> +					   GFP_KERNEL | GFP_DMA);
While correct, instead I would go with kmalloc() and get rid of sizeof(u8).

Horia