File 0001-Added-bounds-checking-to-CDataMoji-in-jww-parser.patch of Package librecad.17497

From f3502963eaf379a429bc9da73c1224c5db649997 Mon Sep 17 00:00:00 2001
From: eldstal <laeder.keps@gmail.com>
Date: Sat, 18 Dec 2021 20:27:34 +0100
Subject: [PATCH] Added bounds checking to CDataMoji in jww parser.

This fixes issue #1462
---
 libraries/jwwlib/src/jwwdoc.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/libraries/jwwlib/src/jwwdoc.h b/libraries/jwwlib/src/jwwdoc.h
index fc8cd217..a11bc63a 100644
--- a/libraries/jwwlib/src/jwwdoc.h
+++ b/libraries/jwwlib/src/jwwdoc.h
@@ -521,7 +521,17 @@ cout << "MojiData1:" << m_strFontName << endl;
 			}else
 			{
 				ifstr >> wd;
+
+        jwDWORD skip = 0;
+				if (wd > 511) {
+					skip = wd - 511;
+					wd = 511;
+				}
+
 				ifstr.read(buf,wd);
+
+				if (skip != 0) ifstr.ignore(skip);
+
 				buf[wd] = '\0';
 				m_strFontName = buf;
 #ifdef	DATA_DUMP
@@ -539,7 +549,17 @@ cout << "MojiData3:"  << m_string << endl;
 			}else
 			{
 				ifstr >> wd;
+
+        jwDWORD skip = 0;
+				if (wd > 511) {
+					skip = wd - 511;
+					wd = 511;
+				}
+
 				ifstr.read(buf,wd);
+
+				if (skip != 0) ifstr.ignore(skip);
+
 				buf[wd] = '\0';
 				m_string = buf;
 #ifdef	DATA_DUMP
-- 
2.36.1