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From 5397a417e61258c69209904e652a1f409ec3b9df Mon Sep 17 00:00:00 2001
From: erouault <erouault>
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 | 2 +-
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/ChangeLog b/ChangeLog
index 668b66a..0f154d6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
2016-12-02 Even Rouault <even.rouault at spatialys.com>
+ * 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
+
+2016-12-02 Even Rouault <even.rouault at spatialys.com>
+
* libtiff/tif_read.c, libtiff/tiffiop.h: fix uint32 overflow in
TIFFReadEncodedStrip() that caused an integer division by zero.
Reported by Agostino Sarubbo.
diff --git a/tools/tiffcp.c b/tools/tiffcp.c
index a99c906..f294ed1 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
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