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[Xen-devel] [PATCH] fix off-by-one error in do_memory_op()'s start_exten

from [Jan Beulich]

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Subject:	[Xen-devel] [PATCH] fix off-by-one error in do_memory_op()'s start_extent range check
From:	"Jan Beulich" <JBeulich@xxxxxxxxxx>
Date:	Tue, 30 Mar 2010 12:34:28 +0100
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Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

--- 2010-03-02.orig/xen/common/memory.c 2010-02-05 09:17:57.000000000 +0100
+++ 2010-03-02/xen/common/memory.c      2010-03-30 13:22:49.000000000 +0200
@@ -525,7 +525,7 @@ long do_memory_op(unsigned long cmd, XEN
         if ( reservation.nr_extents > (ULONG_MAX >> MEMOP_EXTENT_SHIFT) )
             return start_extent;
 
-        if ( unlikely(start_extent > reservation.nr_extents) )
+        if ( unlikely(start_extent >= reservation.nr_extents) )
             return start_extent;
 
         args.extent_list  = reservation.extent_start;

memory-op-start-extent-check.patch
Description: Text document

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