From 5c080298d59efa53264d7248bbe3a04660db6ef7 Mon Sep 17 00:00:00 2001
From: erouault <erouault>
Date: Wed, 11 Jan 2017 19:25:44 +0000
Subject: [PATCH] * tools/tiffcp.c: error out cleanly in cpContig2SeparateByRow
 and cpSeparate2ContigByRow if BitsPerSample != 8 to avoid heap based
 overflow. Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2656 and
 http://bugzilla.maptools.org/show_bug.cgi?id=2657

---
 ChangeLog      |  7 +++++++
 tools/tiffcp.c | 24 ++++++++++++++++++++++--
 2 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index f78cad0..064f25b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2017-01-11 Even Rouault <even.rouault at spatialys.com>
+
+	* tools/tiffcp.c: error out cleanly in cpContig2SeparateByRow and
+	cpSeparate2ContigByRow if BitsPerSample != 8 to avoid heap based overflow.
+	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2656 and
+	http://bugzilla.maptools.org/show_bug.cgi?id=2657
+
 2016-12-20 Even Rouault <even.rouault at spatialys.com>
 
 	* tools/tiff2pdf.c: avoid potential heap-based overflow in
diff --git a/tools/tiffcp.c b/tools/tiffcp.c
index bdf754c..8bbcd52 100644
--- a/tools/tiffcp.c
+++ b/tools/tiffcp.c
@@ -591,7 +591,7 @@ static	copyFunc pickCopyFunc(TIFF*, TIFF*, uint16, uint16);
 static int
 tiffcp(TIFF* in, TIFF* out)
 {
-	uint16 bitspersample, samplesperpixel = 1;
+	uint16 bitspersample = 1, samplesperpixel = 1;
 	uint16 input_compression, input_photometric = PHOTOMETRIC_MINISBLACK;
 	copyFunc cf;
 	uint32 width, length;
@@ -1067,6 +1067,16 @@ DECLAREcpFunc(cpContig2SeparateByRow)
 	register uint32 n;
 	uint32 row;
 	tsample_t s;
+        uint16 bps = 0;
+
+        (void) TIFFGetField(in, TIFFTAG_BITSPERSAMPLE, &bps);
+        if( bps != 8 )
+        {
+            TIFFError(TIFFFileName(in),
+                      "Error, can only handle BitsPerSample=8 in %s",
+                      "cpContig2SeparateByRow");
+            return 0;
+        }
 
 	inbuf = _TIFFmalloc(scanlinesizein);
 	outbuf = _TIFFmalloc(scanlinesizeout);
@@ -1120,6 +1130,16 @@ DECLAREcpFunc(cpSeparate2ContigByRow)
 	register uint32 n;
 	uint32 row;
 	tsample_t s;
+        uint16 bps = 0;
+
+        (void) TIFFGetField(in, TIFFTAG_BITSPERSAMPLE, &bps);
+        if( bps != 8 )
+        {
+            TIFFError(TIFFFileName(in),
+                      "Error, can only handle BitsPerSample=8 in %s",
+                      "cpSeparate2ContigByRow");
+            return 0;
+        }
 
 	inbuf = _TIFFmalloc(scanlinesizein);
 	outbuf = _TIFFmalloc(scanlinesizeout);
@@ -1784,7 +1804,7 @@ pickCopyFunc(TIFF* in, TIFF* out, uint16 bitspersample, uint16 samplesperpixel)
 	uint32 w, l, tw, tl;
 	int bychunk;
 
-	(void) TIFFGetField(in, TIFFTAG_PLANARCONFIG, &shortv);
+	(void) TIFFGetFieldDefaulted(in, TIFFTAG_PLANARCONFIG, &shortv);
 	if (shortv != config && bitspersample != 8 && samplesperpixel > 1) {
 		fprintf(stderr,
 		    "%s: Cannot handle different planar configuration w/ bits/sample != 8\n",
