fixing overrelease and out-of-bounds write, fixes #13725

[wxWidgets.git] / src / common / process.cpp

diff --git a/src/common/process.cpp b/src/common/process.cpp
index 2e32b8cd744b74edf8ddbba3bb62a4a073cb3330..210068e955d73170945b274bd0f47e3f63d5af8d 100644 (file)
--- a/src/common/process.cpp
+++ b/src/common/process.cpp
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        process.cpp
+// Name:        src/common/process.cpp
 // Purpose:     Process termination classes
 // Author:      Guilhem Lavaux
 // Modified by: Vadim Zeitlin to check error codes, added Detach() method
@@ -30,7 +30,7 @@
 // event tables and such
 // ----------------------------------------------------------------------------
 
-DEFINE_EVENT_TYPE(wxEVT_END_PROCESS)
+wxDEFINE_EVENT( wxEVT_END_PROCESS, wxProcessEvent );
 
 IMPLEMENT_DYNAMIC_CLASS(wxProcess, wxEvtHandler)
 IMPLEMENT_DYNAMIC_CLASS(wxProcessEvent, wxEvent)
@@ -43,21 +43,13 @@ IMPLEMENT_DYNAMIC_CLASS(wxProcessEvent, wxEvent)
 // wxProcess creation
 // ----------------------------------------------------------------------------
 
-#if WXWIN_COMPATIBILITY_2_2
-
-wxProcess::wxProcess(wxEvtHandler *parent, bool redirect)
-{
-    Init(parent, wxID_ANY, redirect ? wxPROCESS_REDIRECT : wxPROCESS_DEFAULT);
-}
-
-#endif // WXWIN_COMPATIBILITY_2_2
-
 void wxProcess::Init(wxEvtHandler *parent, int id, int flags)
 {
     if ( parent )
         SetNextHandler(parent);
 
     m_id         = id;
+    m_pid        = 0;
     m_redirect   = (flags & wxPROCESS_REDIRECT) != 0;
 
 #if wxUSE_STREAMS
@@ -72,13 +64,16 @@ wxProcess *wxProcess::Open(const wxString& cmd, int flags)
 {
     wxASSERT_MSG( !(flags & wxEXEC_SYNC), wxT("wxEXEC_SYNC should not be used." ));
     wxProcess *process = new wxProcess(wxPROCESS_REDIRECT);
-    if ( !wxExecute(cmd, flags, process) )
+    long pid = wxExecute(cmd, flags, process);
+    if( !pid )
     {
         // couldn't launch the process
         delete process;
         return NULL;
     }
 
+    process->SetPid(pid);
+
     return process;
 }
 
@@ -107,7 +102,13 @@ void wxProcess::OnTerminate(int pid, int status)
 
 void wxProcess::Detach()
 {
-    SetNextHandler(NULL);
+    // we just detach from the next handler of the chain (i.e. our "parent" -- see ctor)
+    // not also from the previous handler like wxEvtHandler::Unlink() would do:
+
+    if (m_nextHandler)
+        m_nextHandler->SetPreviousHandler(m_previousHandler);
+
+    m_nextHandler = NULL;
 }
 
 // ----------------------------------------------------------------------------
@@ -167,7 +168,7 @@ bool wxProcess::Exists(int pid)
         default:
         case wxKILL_ERROR:
         case wxKILL_BAD_SIGNAL:
-            wxFAIL_MSG( _T("unexpected wxProcess::Kill() return code") );
+            wxFAIL_MSG( wxT("unexpected wxProcess::Kill() return code") );
             // fall through
 
         case wxKILL_NO_PROCESS: