From d60332057b9575ada4f264489582b13e30137be1 Mon Sep 17 00:00:00 2001
From: erouault <erouault>
Date: Wed, 11 Jan 2017 19:02:49 +0000
Subject: [PATCH] * 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
---
 libtiff/tif_read.c  | 4 +++-
 libtiff/tif_unix.c  | 8 ++++++++
 libtiff/tif_win32.c | 8 ++++++++
 libtiff/tiffio.h    | 1 +
 6 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/libtiff/tif_read.c b/libtiff/tif_read.c
index 277fdd6..4535ccb 100644
--- a/libtiff/tif_read.c
+++ b/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) {
diff --git a/libtiff/tif_unix.c b/libtiff/tif_unix.c
index 7c7bc96..89dd32e 100644
--- a/libtiff/tif_unix.c
+++ b/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)
 {
diff --git a/libtiff/tif_win32.c b/libtiff/tif_win32.c
index d730b3a..3e9001b 100644
--- a/libtiff/tif_win32.c
+++ b/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)
 {
diff --git a/libtiff/tiffio.h b/libtiff/tiffio.h
index 732da17..fbd9171 100644
--- a/libtiff/tiffio.h
+++ b/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);