X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/b903802e0838d2a5de8be099c8d764147fcc624c..575cabba69600557a34a08ddefad66628296ffad:/src/msw/debughlp.cpp

diff --git a/src/msw/debughlp.cpp b/src/msw/debughlp.cpp
index 8075dd672a..d2ddec0146 100644
--- a/src/msw/debughlp.cpp
+++ b/src/msw/debughlp.cpp
@@ -25,7 +25,7 @@
 
 #include "wx/msw/debughlp.h"
 
-#if wxUSE_DBGHELP
+#if wxUSE_DBGHELP && wxUSE_DYNLIB_CLASS
 
 // ----------------------------------------------------------------------------
 // constants
@@ -145,7 +145,7 @@ const wxString& wxDbgHelpDLL::GetErrorMessage()
 void wxDbgHelpDLL::LogError(const wxChar *func)
 {
     ::OutputDebugString(wxString::Format(_T("dbghelp: %s() failed: %s\r\n"),
-                        func, wxSysErrorMsg(::GetLastError())));
+                        func, wxSysErrorMsg(::GetLastError())).wx_str());
 }
 
 // ----------------------------------------------------------------------------
@@ -391,7 +391,7 @@ wxDbgHelpDLL::DumpUDT(PSYMBOL_INFO pSym, void *pVariable, unsigned level)
     s.reserve(512);
     s = GetSymbolName(pSym);
 
-#if !wxUSE_STL
+#if !wxUSE_STD_STRING
     // special handling for ubiquitous wxString: although the code below works
     // for it as well, it shows the wxStringBase class and takes 4 lines
     // instead of only one as this branch
@@ -399,13 +399,27 @@ wxDbgHelpDLL::DumpUDT(PSYMBOL_INFO pSym, void *pVariable, unsigned level)
     {
         wxString *ps = (wxString *)pVariable;
 
-        // take care to use c_str() here as otherwise we might hit an assert in
-        // wxString code if it is currently locked for writing (i.e. we're
-        // between GetWriteBuf() and UngetWriteBuf() calls)
-        s << _T("(\"") << ps->c_str() << _T(")\"");
+        // we can't just dump wxString directly as it could be corrupted or
+        // invalid and it could also be locked for writing (i.e. if we're
+        // between GetWriteBuf() and UngetWriteBuf() calls) and assert when we
+        // try to access it contents using public methods, so instead use our
+        // knowledge of its internals
+        const wxChar *p = NULL;
+        if ( !::IsBadReadPtr(ps, sizeof(wxString)) )
+        {
+            p = ps->data();
+            wxStringData *data = (wxStringData *)p - 1;
+            if ( ::IsBadReadPtr(data, sizeof(wxStringData)) ||
+                    ::IsBadReadPtr(p, sizeof(wxChar *)*data->nAllocLength) )
+            {
+                p = NULL; // don't touch this pointer with 10 feet pole
+            }
+        }
+
+        s << _T("(\"") << (p ? p : _T("???")) << _T(")\"");
     }
     else // any other UDT
-#endif // !wxUSE_STL
+#endif // !wxUSE_STD_STRING
     {
         // Determine how many children this type has.
         DWORD dwChildrenCount = 0;