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x86/mm/init.c: Fix devmem_is_allowed() off by one
author
T Makphaibulchoke
<tmac@hp.com>
Wed, 29 Aug 2012 03:21:43 +0000
(21:21 -0600)
committer
Ben Hutchings
<ben@decadent.org.uk>
Tue, 18 Jul 2017 17:38:44 +0000
(18:38 +0100)
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 <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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
arch/x86/mm/init.c
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diff --git
a/arch/x86/mm/init.c
b/arch/x86/mm/init.c
index
a4cca06
..
222f5b7
100644
(file)
--- 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;