gentoo-overlay/media-libs/tiff/files/tiff-4.0.7-bug2598.patch

http://bugzilla.maptools.org/show_bug.cgi?id=2598

From bc3d7392e43545c7c6375897458a7a3e8ee4d9d8 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Fri, 2 Dec 2016 22:13:32 +0000
Subject: [PATCH] * tools/tiffcp.c: avoid uint32 underflow in cpDecodedStrips
 that can cause various issues, such as buffer overflows in the library.
 Reported by Agostino Sarubbo. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2598

---
 ChangeLog      | 7 +++++++
 tools/tiffcp.c | 4 ++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/tools/tiffcp.c b/tools/tiffcp.c
index 338a3d113bf8..6dfb9a91bfa9 100644
--- a/tools/tiffcp.c
+++ b/tools/tiffcp.c
@@ -985,7 +985,7 @@ DECLAREcpFunc(cpDecodedStrips)
 		tstrip_t s, ns = TIFFNumberOfStrips(in);
 		uint32 row = 0;
 		_TIFFmemset(buf, 0, stripsize);
-		for (s = 0; s < ns; s++) {
+		for (s = 0; s < ns && row < imagelength; s++) {
 			tsize_t cc = (row + rowsperstrip > imagelength) ?
 			    TIFFVStripSize(in, imagelength - row) : stripsize;
 			if (TIFFReadEncodedStrip(in, s, buf, cc) < 0
-- 
2.12.0