Commit f95fb77e authored by T Makphaibulchoke's avatar T Makphaibulchoke Committed by Ben Hutchings

x86/mm/init.c: Fix devmem_is_allowed() off by one

commit 73e8f3d7 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: default avatarT Makphaibulchoke <tmac@hp.com>
Acked-by: default avatarH. 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.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent 883aafc5
...@@ -326,7 +326,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start, ...@@ -326,7 +326,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
*/ */
int devmem_is_allowed(unsigned long pagenr) int devmem_is_allowed(unsigned long pagenr)
{ {
if (pagenr <= 256) if (pagenr < 256)
return 1; return 1;
if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
return 0; return 0;
......
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