From: Andi Kleen <ak@suse.de>
Date: Wed, 11 Jan 2006 21:43:39 +0000 (+0100)
Subject: [PATCH] x86_64: Fix off by one in acpi table mapping
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7a4a76cc1057de0dc96ee481590347aa8c5b9ffb;p=linux-beck.git

[PATCH] x86_64: Fix off by one in acpi table mapping

And fix the test to include the size

Noticed by Vivek Goyal

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c
index 447fa9e33ffb..2111529dea77 100644
--- a/arch/i386/kernel/acpi/boot.c
+++ b/arch/i386/kernel/acpi/boot.c
@@ -108,7 +108,7 @@ char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
 	if (!phys_addr || !size)
 		return NULL;
 
-	if (phys_addr < (end_pfn_map << PAGE_SHIFT))
+	if (phys_addr+size <= (end_pfn_map << PAGE_SHIFT) + PAGE_SIZE)
 		return __va(phys_addr);
 
 	return NULL;