linux-kernel - Re: [PATCH] x86/efi: Use kmalloc_array() in efi_call_phys

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Date:   Thu, 25 Aug 2016 13:32:51 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        linux-efi@...r.kernel.org, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] x86/efi: Use kmalloc_array() in efi_call_phys_prolog()



On 25/08/2016 11:40, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Thu, 25 Aug 2016 11:34:03 +0200
> 
> * A multiplication for the size determination of a memory allocation
>   indicated that an array data structure should be processed.
>   Thus reuse 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>
> ---
>  arch/x86/platform/efi/efi_64.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
> index 677e29e..311022a 100644
> --- a/arch/x86/platform/efi/efi_64.c
> +++ b/arch/x86/platform/efi/efi_64.c
> @@ -85,7 +85,7 @@ pgd_t * __init efi_call_phys_prolog(void)
>  	early_code_mapping_set_exec(1);
>  
>  	n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE);
> -	save_pgd = kmalloc(n_pgds * sizeof(pgd_t), GFP_KERNEL);
> +	save_pgd = kmalloc_array(n_pgds, sizeof(*save_pgd), GFP_KERNEL);
>  
>  	for (pgd = 0; pgd < n_pgds; pgd++) {
>  		save_pgd[pgd] = *pgd_offset_k(pgd * PGDIR_SIZE);
> 

Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>