Fixes CVE-2017-7594 (Direct leak in tif_ojpeg.c):

http://bugzilla.maptools.org/show_bug.cgi?id=2659
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7594
https://security-tracker.debian.org/tracker/CVE-2017-7594

2017-01-12 Even Rouault <even.rouault at spatialys.com>

        * libtiff/tif_ojpeg.c: fix leak in OJPEGReadHeaderInfoSecTablesAcTable
        when read fails.
        Patch by Nicolás Peña.
        Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2659

/cvs/maptools/cvsroot/libtiff/ChangeLog,v  <--  ChangeLog
new revision: 1.1212; previous revision: 1.1211
/cvs/maptools/cvsroot/libtiff/libtiff/tif_ojpeg.c,v  <--  libtiff/tif_ojpeg.c
new revision: 1.67; previous revision: 1.66

Index: libtiff/libtiff/tif_ojpeg.c
===================================================================
RCS file: /cvs/maptools/cvsroot/libtiff/libtiff/tif_ojpeg.c,v
retrieving revision 1.67
retrieving revision 1.68
diff -u -r1.67 -r1.68
--- libtiff/libtiff/tif_ojpeg.c	12 Jan 2017 17:43:26 -0000	1.67
+++ libtiff/libtiff/tif_ojpeg.c	12 Jan 2017 19:23:20 -0000	1.68
@@ -1,4 +1,4 @@
-/* $Id: tif_ojpeg.c,v 1.66 2016-12-03 11:15:18 erouault Exp $ */
+/* $Id: tif_ojpeg.c,v 1.68 2017-01-12 19:23:20 erouault Exp $ */
 
 /* WARNING: The type of JPEG encapsulation defined by the TIFF Version 6.0
    specification is now totally obsolete and deprecated for new applications and
@@ -1790,7 +1790,10 @@
 			TIFFSeekFile(tif,sp->qtable_offset[m],SEEK_SET); 
 			p=(uint32)TIFFReadFile(tif,&ob[sizeof(uint32)+5],64);
 			if (p!=64)
+                        {
+                                _TIFFfree(ob);
 				return(0);
+                        }
 			sp->qtable[m]=ob;
 			sp->sof_tq[m]=m;
 		}
@@ -1854,7 +1857,10 @@
 				rb[sizeof(uint32)+5+n]=o[n];
 			p=(uint32)TIFFReadFile(tif,&(rb[sizeof(uint32)+21]),q);
 			if (p!=q)
+                        {
+                                _TIFFfree(rb);
 				return(0);
+                        }
 			sp->dctable[m]=rb;
 			sp->sos_tda[m]=(m<<4);
 		}