svn commit: r258144 - stable/9/sys/vm

[John Baldwin]

Author: jhb
Date: Thu Nov 14 21:27:13 2013
New Revision: 258144
URL: http://svnweb.freebsd.org/changeset/base/258144

Log:
  MFC 255497:
  Fix an off-by-one error when populating mincore(2) entries for
  skipped entries.  lastvecindex references the last valid byte,
  so the new bytes should come after it.

Modified:
  stable/9/sys/vm/vm_mmap.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/vm/vm_mmap.c
==============================================================================
--- stable/9/sys/vm/vm_mmap.c	Thu Nov 14 20:21:05 2013	(r258143)
+++ stable/9/sys/vm/vm_mmap.c	Thu Nov 14 21:27:13 2013	(r258144)
@@ -963,12 +963,12 @@ RestartScan:
 			 * the byte vector is zeroed for those skipped entries.
 			 */
 			while ((lastvecindex + 1) < vecindex) {
+				++lastvecindex;
 				error = subyte(vec + lastvecindex, 0);
 				if (error) {
 					error = EFAULT;
 					goto done2;
 				}
-				++lastvecindex;
 			}
 
 			/*
@@ -1004,12 +1004,12 @@ RestartScan:
 	 */
 	vecindex = OFF_TO_IDX(end - first_addr);
 	while ((lastvecindex + 1) < vecindex) {
+		++lastvecindex;
 		error = subyte(vec + lastvecindex, 0);
 		if (error) {
 			error = EFAULT;
 			goto done2;
 		}
-		++lastvecindex;
 	}
 
 	/*