From f95fb77e908a1efa2772f2155d1db87ca6664d67 Mon Sep 17 00:00:00 2001 From: T Makphaibulchoke Date: Tue, 28 Aug 2012 21:21:43 -0600 Subject: [PATCH] x86/mm/init.c: Fix devmem_is_allowed() off by one commit 73e8f3d7e2cb23614d5115703d76d8e54764b641 upstream. 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 Acked-by: H. Peter Anvin 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 Signed-off-by: Ben Hutchings --- arch/x86/mm/init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index a4cca066c889..222f5b756137 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -326,7 +326,7 @@ 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; -- 2.39.2