linux-kernel - [PATCH] x86/mm/init.c: devmem_is

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Date:	Tue, 28 Aug 2012 21:21:43 -0600
From:	T Makphaibulchoke <tmac@...com>
To:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, akpm@...ux-foundation.org, yinghai@...nel.org,
	tiwai@...e.de, dhowells@...hat.com, linux-kernel@...r.kernel.org
Cc:	T Makphaibulchoke <tmac@...com>
Subject: [PATCH] x86/mm/init.c: devmem_is_allowed() off by one

Fixing an off-by-one error in devmem_is_allowed(), which allows accesses to
physical addresses 0x100000-0x100fff, an extra page past 1MB.

Signed-off-by: T Makphaibulchoke <tmac@...com>
---
 arch/x86/mm/init.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index e0e6990..ab1f6a9 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -319,7 +319,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
  */
 int devmem_is_allowed(unsigned long pagenr)
 {
-	if (pagenr <= 256)
+	if (pagenr < 256)
 		return 1;
 	if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
 		return 0;
-- 
1.7.1

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