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[Xen-changelog] [xen-unstable] 32-on-64: Fix an one-off error in compat_

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Subject:	[Xen-changelog] [xen-unstable] 32-on-64: Fix an one-off error in compat_addr_ok().
From:	Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>
Date:	Sat, 27 Jan 2007 13:00:16 -0800
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# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxxx
# Date 1169818612 0
# Node ID 057c4c2991fa650e91300301e5cac865f98889d2
# Parent  fcaf34bc5e4129c4299e5db3be1a9cac3c0259ca
32-on-64: Fix an one-off error in compat_addr_ok().
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
---
 xen/include/asm-x86/x86_64/uaccess.h |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

diff -r fcaf34bc5e41 -r 057c4c2991fa xen/include/asm-x86/x86_64/uaccess.h
--- a/xen/include/asm-x86/x86_64/uaccess.h      Fri Jan 26 13:34:02 2007 +0000
+++ b/xen/include/asm-x86/x86_64/uaccess.h      Fri Jan 26 13:36:52 2007 +0000
@@ -20,7 +20,8 @@
 #define __compat_addr_ok(addr) \
     ((unsigned long)(addr) < HYPERVISOR_COMPAT_VIRT_START(current->domain))
 
-#define compat_access_ok(addr, size) __compat_addr_ok((addr) + (size))
+#define compat_access_ok(addr, size) \
+    __compat_addr_ok((unsigned long)(addr) + ((size) ? (size) - 1 : 0))
 
 #define compat_array_access_ok(addr,count,size) \
     (likely((count) < (~0U / (size))) && \

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