From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753352Ab2H2DVt (ORCPT ); Tue, 28 Aug 2012 23:21:49 -0400 Received: from g1t0026.austin.hp.com ([15.216.28.33]:11324 "EHLO g1t0026.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752875Ab2H2DVs (ORCPT ); Tue, 28 Aug 2012 23:21:48 -0400 From: T Makphaibulchoke To: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, akpm@linux-foundation.org, yinghai@kernel.org, tiwai@suse.de, dhowells@redhat.com, linux-kernel@vger.kernel.org Cc: T Makphaibulchoke Subject: [PATCH] x86/mm/init.c: devmem_is_allowed() off by one Date: Tue, 28 Aug 2012 21:21:43 -0600 Message-Id: <1346210503-14276-1-git-send-email-tmac@hp.com> X-Mailer: git-send-email 1.7.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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