From d22aad54e9d2b0a5d9e5ee31639b61e44bea5769 Mon Sep 17 00:00:00 2001
From: Neil <nyamatongwe@gmail.com>
Date: Tue, 19 Aug 2014 09:20:25 +1000
Subject: Bug [#1645]. Validate position of deletion.

---
 src/Document.cxx | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src')

diff --git a/src/Document.cxx b/src/Document.cxx
index 4c1901679..e9824d9dd 100644
--- a/src/Document.cxx
+++ b/src/Document.cxx
@@ -937,6 +937,8 @@ void Document::CheckReadOnly() {
 // SetStyleAt does not change the persistent state of a document
 
 bool Document::DeleteChars(int pos, int len) {
+	if (pos < 0)
+		return false;
 	if (len <= 0)
 		return false;
 	if ((pos + len) > Length())
-- 
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