From 2b0d0e699730d1f26bbeba8397bfdf0e9e01e59d Mon Sep 17 00:00:00 2001
From: Thomas Bernard <miniupnp@free.fr>
Date: Mon, 11 Feb 2019 10:05:33 +0100
Subject: [PATCH 1/2] check that (Tile Width)*(Samples/Pixel) do no overflow

fixes bug 2833
---
 tools/tiffcp.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/tiffcp.c b/tools/tiffcp.c
index 2f406e2d7..f0ee2c029 100644
--- a/tools/tiffcp.c
+++ b/tools/tiffcp.c
@@ -1408,7 +1408,7 @@ DECLAREreadFunc(readSeparateTilesIntoBuffer)
 	int status = 1;
 	uint32 imagew = TIFFRasterScanlineSize(in);
 	uint32 tilew = TIFFTileRowSize(in);
-	int iskew  = imagew - tilew*spp;
+	int iskew;
 	tsize_t tilesize = TIFFTileSize(in);
 	tdata_t tilebuf;
 	uint8* bufp = (uint8*) buf;
@@ -1416,6 +1416,12 @@ DECLAREreadFunc(readSeparateTilesIntoBuffer)
 	uint32 row;
 	uint16 bps = 0, bytes_per_sample;
 
+	if (spp > (0x7fffffff / tilew))
+	{
+		TIFFError(TIFFFileName(in), "Error, cannot handle that much samples per tile row (Tile Width * Samples/Pixel)");
+		return 0;
+	}
+	iskew = imagew - tilew*spp;
 	tilebuf = _TIFFmalloc(tilesize);
 	if (tilebuf == 0)
 		return 0;
-- 
2.21.0


From 7cc76e9bc40bc8eb329a718ab26ecef7dd1afd94 Mon Sep 17 00:00:00 2001
From: Thomas Bernard <miniupnp@free.fr>
Date: Mon, 11 Feb 2019 21:42:03 +0100
Subject: [PATCH 2/2] tiffcp.c: use INT_MAX

---
 tools/tiffcp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/tiffcp.c b/tools/tiffcp.c
index f0ee2c029..8c81aa4f2 100644
--- a/tools/tiffcp.c
+++ b/tools/tiffcp.c
@@ -41,6 +41,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <limits.h>
 
 #include <ctype.h>
 
@@ -1416,7 +1417,7 @@ DECLAREreadFunc(readSeparateTilesIntoBuffer)
 	uint32 row;
 	uint16 bps = 0, bytes_per_sample;
 
-	if (spp > (0x7fffffff / tilew))
+	if (spp > (INT_MAX / tilew))
 	{
 		TIFFError(TIFFFileName(in), "Error, cannot handle that much samples per tile row (Tile Width * Samples/Pixel)");
 		return 0;
-- 
2.21.0