Fix CVE-2016-10092:

http://bugzilla.maptools.org/show_bug.cgi?id=2620
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-10092
https://security-tracker.debian.org/tracker/CVE-2016-10092

2016-12-03 Even Rouault <even.rouault at spatialys.com>

        * tools/tiffcrop.c: fix readContigStripsIntoBuffer() in -i (ignore)
	mode so that the output buffer is correctly incremented to avoid write
	outside bounds.
        Reported by Agostino Sarubbo.
        Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2620

/cvs/maptools/cvsroot/libtiff/ChangeLog,v  <--  ChangeLog
new revision: 1.1178; previous revision: 1.1177
/cvs/maptools/cvsroot/libtiff/tools/tiffcrop.c,v  <--  tools/tiffcrop.c
new revision: 1.47; previous revision: 1.46

Index: libtiff/tools/tiffcrop.c
===================================================================
RCS file: /cvs/maptools/cvsroot/libtiff/tools/tiffcrop.c,v
retrieving revision 1.46
retrieving revision 1.47
diff -u -r1.46 -r1.47
--- libtiff/tools/tiffcrop.c	18 Nov 2016 14:58:46 -0000	1.46
+++ libtiff/tools/tiffcrop.c	3 Dec 2016 11:35:56 -0000	1.47
@@ -1,4 +1,4 @@
-/* $Id: tiffcrop.c,v 1.46 2016-11-18 14:58:46 erouault Exp $ */
+/* $Id: tiffcrop.c,v 1.47 2016-12-03 11:35:56 erouault Exp $ */
 
 /* tiffcrop.c -- a port of tiffcp.c extended to include manipulations of
  * the image data through additional options listed below
@@ -3698,7 +3698,7 @@
                                   (unsigned long) strip, (unsigned long)rows);
                         return 0;
                 }
-                bufp += bytes_read;
+                bufp += stripsize;
         }
 
         return 1;