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[Xen-devel] [PATCH] another 32-on-64 bugfix

from [Jan Beulich]

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Subject:	[Xen-devel] [PATCH] another 32-on-64 bugfix
From:	"Jan Beulich" <jbeulich@xxxxxxxxxx>
Date:	Thu, 25 Jan 2007 15:04:21 +0000
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Fix a one-off error in compat_addr_ok().

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

Index: 2007-01-08/xen/include/asm-x86/x86_64/uaccess.h
===================================================================
--- 2007-01-08.orig/xen/include/asm-x86/x86_64/uaccess.h        2006-12-18 
09:49:18.000000000 +0100
+++ 2007-01-08/xen/include/asm-x86/x86_64/uaccess.h     2007-01-25 
15:18:37.000000000 +0100
@@ -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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