lkml.org 
[lkml]   [2012]   [Sep]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:x86/urgent] x86/mm/init.c: Fix devmem_is_allowed() off by one
Commit-ID:  73e8f3d7e2cb23614d5115703d76d8e54764b641
Gitweb: http://git.kernel.org/tip/73e8f3d7e2cb23614d5115703d76d8e54764b641
Author: T Makphaibulchoke <tmac@hp.com>
AuthorDate: Tue, 28 Aug 2012 21:21:43 -0600
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 13 Sep 2012 17:35:54 +0200

x86/mm/init.c: Fix 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@hp.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Cc: yinghai@kernel.org
Cc: tiwai@suse.de
Cc: dhowells@redhat.com
Link: http://lkml.kernel.org/r/1346210503-14276-1-git-send-email-tmac@hp.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
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;

\
 
 \ /
  Last update: 2012-09-14 09:01    [W:0.078 / U:0.268 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site