linux-kernel - [patch v2] iommu: off by one in dmar_get_fault

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Message-ID: <20120513170938.GA4280@elgon.mountain>
Date:	Sun, 13 May 2012 20:09:38 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	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,
	walter harms <wharms@....de>
Subject: [patch v2] iommu: off by one in dmar_get_fault_reason()

fault_reason - 0x20 == ARRAY_SIZE(irq_remap_fault_reasons) is one past
the end of the array.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
v2: re-arranged slightly for readability

diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 5ef65cf..3a74e44 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -1057,8 +1057,8 @@ 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 +
-				     ARRAY_SIZE(irq_remap_fault_reasons))) {
+	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];
 	} else if (fault_reason < ARRAY_SIZE(dma_remap_fault_reasons)) {
--
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