linux-kernel - Re: [patch] iommu: off by one in dmar_get_fault

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Date:	Sat, 12 May 2012 14:36:42 +0200
From:	walter harms <wharms@....de>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Ingo Molnar <mingo@...e.hu>,
	Joerg Roedel <joerg.roedel@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Youquan Song <youquan.song@...el.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] iommu: off by one in dmar_get_fault_reason()



Am 12.05.2012 12:59, schrieb Dan Carpenter:
> fault_reason == ARRAY_SIZE(irq_remap_fault_reasons) + 0x20 - 0x20 is one
> past the end of the array.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
> index 5ef65cf..9390f3f 100644
> --- a/drivers/iommu/dmar.c
> +++ b/drivers/iommu/dmar.c
> @@ -1057,7 +1057,7 @@ static const char *irq_remap_fault_reasons[] =
>  
>  const char *dmar_get_fault_reason(u8 fault_reason, int *fault_type)
>  {
> -	if (fault_reason >= 0x20 && (fault_reason <= 0x20 +
> +	if (fault_reason >= 0x20 && (fault_reason < 0x20 +
>  				     ARRAY_SIZE(irq_remap_fault_reasons))) {
>  		*fault_type = INTR_REMAP;
>  		return irq_remap_fault_reasons[fault_reason - 0x20];

perhaps this is more readable:
if (fault_reason >= 0x20 && (fault_reason - 0x20 < ARRAY_SIZE(irq_remap_fault_reasons)))

re,
 wh
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