linux-kernel - Re: [PATCH] VMCI: Use kmalloc_array() in qp_alloc_ppn

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Date:   Mon, 9 Jan 2017 10:40:06 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        George Zhang <georgezhang@...are.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] VMCI: Use kmalloc_array() in qp_alloc_ppn_set()

On Sun 08-01-17 17:37:08, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sun, 8 Jan 2017 14:04:10 +0100
> 
> Multiplications for the size determination of memory allocations
> indicated that array data structures should be processed.
> Thus use the corresponding function "kmalloc_array".
> 
> This issue was detected by using the Coccinelle software.

I am surprised that Coccinelle found a single instance of this pattern.
If there are more then I would suggest changing all of them at once
along with the coccinelle program which has been used.

> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/misc/vmw_vmci/vmci_queue_pair.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/misc/vmw_vmci/vmci_queue_pair.c b/drivers/misc/vmw_vmci/vmci_queue_pair.c
> index 498c0854305f..7b5c8a89cc54 100644
> --- a/drivers/misc/vmw_vmci/vmci_queue_pair.c
> +++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c
> @@ -486,13 +486,15 @@ static int qp_alloc_ppn_set(void *prod_q,
>  	if (ppn_set->initialized)
>  		return VMCI_ERROR_ALREADY_EXISTS;
>  
> -	produce_ppns =
> -	    kmalloc(num_produce_pages * sizeof(*produce_ppns), GFP_KERNEL);
> +	produce_ppns = kmalloc_array(num_produce_pages,
> +				     sizeof(*produce_ppns),
> +				     GFP_KERNEL);
>  	if (!produce_ppns)
>  		return VMCI_ERROR_NO_MEM;
>  
> -	consume_ppns =
> -	    kmalloc(num_consume_pages * sizeof(*consume_ppns), GFP_KERNEL);
> +	consume_ppns = kmalloc_array(num_consume_pages,
> +				     sizeof(*consume_ppns),
> +				     GFP_KERNEL);
>  	if (!consume_ppns) {
>  		kfree(produce_ppns);
>  		return VMCI_ERROR_NO_MEM;
> -- 
> 2.11.0
> 

-- 
Michal Hocko
SUSE Labs