commit 6d3ef98b2415b2edfa36a5ba600d5a824c094309
Author: erouault <erouault>
Date:   Sat Dec 3 14:42:40 2016 +0000

    * tools/tiffcp.c: avoid potential division by zero if BitsPerSamples tag is
    missing.
    Reported by Agostino Sarubbo.
    Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2597

diff --git a/ChangeLog b/ChangeLog
index e41d00c..0d7b12d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
 2016-12-03 Even Rouault <even.rouault at spatialys.com>
 
+	* tools/tiffcp.c: avoid potential division by zero if BitsPerSamples tag is
+	missing.
+	Reported by Agostino Sarubbo.
+	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2597
+
+2016-12-03 Even Rouault <even.rouault at spatialys.com>
+
 	* tools/tiffinfo.c: fix null pointer dereference in -r mode when the image has
 	no StripByteCount tag.
 	Reported by Agostino Sarubbo.
diff --git a/tools/tiffcp.c b/tools/tiffcp.c
index 6dfb9a9..c8e48c3 100644
--- a/tools/tiffcp.c
+++ b/tools/tiffcp.c
@@ -1,4 +1,4 @@
-/* $Id: tiffcp.c,v 1.56 2016-12-02 22:13:32 erouault Exp $ */
+/* $Id: tiffcp.c,v 1.57 2016-12-03 14:42:40 erouault Exp $ */
 
 /*
  * Copyright (c) 1988-1997 Sam Leffler
@@ -1378,7 +1378,7 @@ DECLAREreadFunc(readSeparateTilesIntoBuffer)
 	uint8* bufp = (uint8*) buf;
 	uint32 tw, tl;
 	uint32 row;
-	uint16 bps, bytes_per_sample;
+	uint16 bps = 0, bytes_per_sample;
 
 	tilebuf = _TIFFmalloc(tilesize);
 	if (tilebuf == 0)
@@ -1387,6 +1387,12 @@ DECLAREreadFunc(readSeparateTilesIntoBuffer)
 	(void) TIFFGetField(in, TIFFTAG_TILEWIDTH, &tw);
 	(void) TIFFGetField(in, TIFFTAG_TILELENGTH, &tl);
 	(void) TIFFGetField(in, TIFFTAG_BITSPERSAMPLE, &bps);
+        if( bps == 0 )
+        {
+            TIFFError(TIFFFileName(in), "Error, cannot read BitsPerSample");
+            status = 0;
+            goto done;
+        }
 	assert( bps % 8 == 0 );
 	bytes_per_sample = bps/8;