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

Horia Geanta Neag
2016-09-15T15:12:53Z

On 9/15/2016 5:43 PM, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@users.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@users.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