Messages in this thread Patch in this message | | | Date | Thu, 13 Sep 2012 23:20:38 -0700 | From | tip-bot for T Makphaibulchoke <> | Subject | [tip:x86/urgent] x86/mm/init.c: Fix devmem_is_allowed() off by one |
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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;
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