fixed memory corruption in wxHTML when parsing '&;' in the markup

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@55388 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -125,6 +125,7 @@ All (GUI):
 - Fixed problem with Floatable(false) not working in wxAuiFrameManager.
 - Fixed maximize bug in wxAUI.
 - Allow period in link anchors in wxHTML.
+- Fixed memory corruption in wxHTML when parsing "&;" in the markup.
 
 All (Unix):
 

src/html/htmlpars.cpp

@@ -572,6 +572,9 @@ wxChar wxHtmlEntitiesParser::GetEntityChar(const wxString& entity)
 {
     unsigned code = 0;
 
+    if (entity.empty())
+      return 0; // invalid entity reference
+
     if (entity[0] == wxT('#'))
     {
         const wxChar *ent_s = entity.c_str();