TDEMarkdown: Ensure that the loaded file content and generated HTML

are terminated by zero terminator to avoid reading overflow.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 0b365bf245)

tdemarkdown/markdown_part.cpp

@@ -73,6 +73,11 @@ bool MarkdownPart::openURL(const KURL& u)
 
       if(!data.isNull())
       {
+          if (data[data.size()-1] != '\0')
+          {
+              data.resize(data.size()+1);
+              data[data.size()-1] = '\0';
+          }
           begin(u);
           TQString parsed(parse((MD_CHAR*) data.data()));
           write(parsed);
@@ -109,6 +114,11 @@ TQString& MarkdownPart::parse(MD_CHAR* document)
     }
     else
     {
+        if (data[data.size()-1] != '\0')
+        {
+            data.resize(data.size()+1);
+            data[data.size()-1] = '\0';
+        }
         m_buffer += TQString::fromLocal8Bit(data);
     }