* libtiff/tiffiop.h, tif_unix.c, tif_win32.c, tif_vms.c: add _TIFFcal…

…loc()

* libtiff/tif_read.c: TIFFReadBufferSetup(): use _TIFFcalloc() to zero
initialize tif_rawdata.
Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2651

ChangeLog

@@ -1,3 +1,11 @@
+2017-01-11 Even Rouault <even.rouault at spatialys.com>
+
+	* libtiff/tiffiop.h, tif_unix.c, tif_win32.c, tif_vms.c: add _TIFFcalloc()
+
+	* libtiff/tif_read.c: TIFFReadBufferSetup(): use _TIFFcalloc() to zero
+	initialize tif_rawdata.
+	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2651
+
 2017-01-11 Even Rouault <even.rouault at spatialys.com>
 
 	* libtiff/tif_getimage.c: add explicit uint32 cast in putagreytile to

libtiff/tif_read.c

@@ -985,7 +985,9 @@ TIFFReadBufferSetup(TIFF* tif, void* bp, tmsize_t size)
 				 "Invalid buffer size");
 		    return (0);
 		}
-		tif->tif_rawdata = (uint8*) _TIFFmalloc(tif->tif_rawdatasize);
+		/* Initialize to zero to avoid uninitialized buffers in case of */
+                /* short reads (http://bugzilla.maptools.org/show_bug.cgi?id=2651) */
+		tif->tif_rawdata = (uint8*) _TIFFcalloc(1, tif->tif_rawdatasize);
 		tif->tif_flags |= TIFF_MYBUFFER;
 	}
 	if (tif->tif_rawdata == NULL) {

libtiff/tif_unix.c

@@ -316,6 +316,14 @@ _TIFFmalloc(tmsize_t s)
 	return (malloc((size_t) s));
 }
 
+void* _TIFFcalloc(tmsize_t nmemb, tmsize_t siz)
+{
+    if( nmemb == 0 || siz == 0 )
+        return ((void *) NULL);
+
+    return calloc((size_t) nmemb, (size_t)siz);
+}
+
 void
 _TIFFfree(void* p)
 {

libtiff/tif_vms.c

@@ -270,6 +270,14 @@ _TIFFmalloc(tsize_t s)
 	return (malloc((size_t) s));
 }
 
+void* _TIFFcalloc(tmsize_t nmemb, tmsize_t siz)
+{
+    if( nmemb == 0 || siz == 0 )
+        return ((void *) NULL);
+
+    return calloc((size_t) nmemb, (size_t)siz);
+}
+
 void
 _TIFFfree(tdata_t p)
 {

libtiff/tif_win32.c

@@ -360,6 +360,14 @@ _TIFFmalloc(tmsize_t s)
 	return (malloc((size_t) s));
 }
 
+void* _TIFFcalloc(tmsize_t nmemb, tmsize_t siz)
+{
+    if( nmemb == 0 || siz == 0 )
+        return ((void *) NULL);
+
+    return calloc((size_t) nmemb, (size_t)siz);
+}
+
 void
 _TIFFfree(void* p)
 {

libtiff/tiffio.h

@@ -293,6 +293,7 @@ extern TIFFCodec* TIFFGetConfiguredCODECs(void);
  */
 
 extern void* _TIFFmalloc(tmsize_t s);
+extern void* _TIFFcalloc(tmsize_t nmemb, tmsize_t siz);
 extern void* _TIFFrealloc(void* p, tmsize_t s);
 extern void _TIFFmemset(void* p, int v, tmsize_t c);
 extern void _TIFFmemcpy(void* d, const void* s, tmsize_t c);