https://github.com/libsdl-org/libtiff/commit/7f10ecccc018ec0ca491e36e6af2502a0af07372
From 7f10ecccc018ec0ca491e36e6af2502a0af07372 Mon Sep 17 00:00:00 2001
From: Frank Warmerdam <[EMAIL REDACTED]>
Date: Thu, 10 Mar 2011 20:22:33 +0000
Subject: [PATCH] allow zero length runs at start of fax3 lines
---
ChangeLog | 5 +++++
libtiff/tif_fax3.h | 8 +++++---
2 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 4ed5e0e5..b30ddefd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2011-03-10 Frank Warmerdam <warmerdam@pobox.com>
+
+ * libtiff/tif_fax3.h: Fix to last change allowing zero length
+ runs at the start of a scanline - needed for legal cases.
+
2011-03-02 Frank Warmerdam <warmerdam@pobox.com>
* libtiff/tif_fax3.h: Protect against a fax VL(n) codeword commanding
diff --git a/libtiff/tif_fax3.h b/libtiff/tif_fax3.h
index f4fc8c8d..d7d7723a 100644
--- a/libtiff/tif_fax3.h
+++ b/libtiff/tif_fax3.h
@@ -1,4 +1,4 @@
-/* $Id: tif_fax3.h,v 1.5.2.2 2011-03-03 01:36:10 fwarmerdam Exp $ */
+/* $Id: tif_fax3.h,v 1.5.2.3 2011-03-10 20:22:33 fwarmerdam Exp $ */
/*
* Copyright (c) 1990-1997 Sam Leffler
@@ -479,8 +479,10 @@ done1d: \
case S_VL: \
CHECK_b1; \
if (b1 <= (int) (a0 + TabEnt->Param)) { \
- unexpected("VL", a0); \
- goto eol2d; \
+ if (b1 < (int) (a0 + TabEnt->Param) || pa != thisrun) { \
+ unexpected("VL", a0); \
+ goto eol2d; \
+ } \
} \
SETVALUE(b1 - a0 - TabEnt->Param); \
b1 -= *--pb; \