linux-kernel - Re: [PATCH 17/26] IB/ocrdma: Use kmalloc_array() in ocrdma_create

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Date:   Wed, 8 Mar 2017 20:35:47 +0530
From:   Devesh Sharma <devesh.sharma@...adcom.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     linux-rdma <linux-rdma@...r.kernel.org>,
        Devesh Sharma <devesh.sharma@...gotech.com>,
        Doug Ledford <dledford@...hat.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Selvin Xavier <selvin.xavier@...gotech.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 17/26] IB/ocrdma: Use kmalloc_array() in ocrdma_create_srq()

On Wed, Mar 8, 2017 at 6:47 PM, SF Markus Elfring
<elfring@...rs.sourceforge.net> wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Wed, 8 Mar 2017 08:45:31 +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 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/infiniband/hw/ocrdma/ocrdma_verbs.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
> index bc9fb144e57b..ef670ac1cbe9 100644
> --- a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
> +++ b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
> @@ -1910,8 +1910,9 @@ struct ib_srq *ocrdma_create_srq(struct ib_pd *ibpd,
>
>                 srq->bit_fields_len = (srq->rq.max_cnt / 32) +
>                     (srq->rq.max_cnt % 32 ? 1 : 0);
> -               srq->idx_bit_fields =
> -                   kmalloc(srq->bit_fields_len * sizeof(u32), GFP_KERNEL);

Lets stick to kmalloc here?

> +               srq->idx_bit_fields = kmalloc_array(srq->bit_fields_len,
> +                                                   sizeof(*srq->idx_bit_fields),
> +                                                   GFP_KERNEL);
>                 if (srq->idx_bit_fields == NULL)
>                         goto arm_err;
>                 memset(srq->idx_bit_fields, 0xff,
> --
> 2.12.0
>