Fix a memory leak in libtiff.

third_party/libtiff/tif_dirread.c

 /* $Id: tif_dirread.c,v 1.191 2015-09-05 20:31:41 bfriesen Exp $ */
 
 /*
  * Copyright (c) 1988-1997 Sam Leffler
  * Copyright (c) 1991-1997 Silicon Graphics, Inc.
  *
  * Permission to use, copy, modify, distribute, and sell this software and
  * its documentation for any purpose is hereby granted without fee, provided
  * that (i) the above copyright notices and this permission notice appear in
  * all copies of the software and related documentation, and (ii) the names of
@@ skipping 5354 matching lines @@
 /*
  * Fetch a set of offsets or lengths.
  * While this routine says "strips", in fact it's also used for tiles.
  */
 static int
 TIFFFetchStripThing(TIFF* tif, TIFFDirEntry* dir, uint32 nstrips, uint64** lpp)
 {
         static const char module[] = "TIFFFetchStripThing";
         enum TIFFReadDirEntryErr err;
         uint64* data;
+        _TIFFfree(*lpp);
+        *lpp = 0;
         err=TIFFReadDirEntryLong8Array(tif,dir,&data);
         if (err!=TIFFReadDirEntryErrOk)
         {
                 const TIFFField* fip = TIFFFieldWithTag(tif,dir->tdir_tag); 
                 TIFFReadDirEntryOutputErr(tif,err,module,fip ? fip->field_name : "unknown tagname",0);
                 return(0);
         }
         if (dir->tdir_count!=(uint64)nstrips)
         {
                 uint64* resizeddata;
@@ skipping 220 matching lines @@
 
 
 /* vim: set ts=8 sts=8 sw=8 noet: */
 /*
  * Local Variables:
  * mode: c
  * c-basic-offset: 8
  * fill-column: 78
  * End:
  */