[RESEND] riched20: Fixed crash when the window procedure is called with NULL hWnd

[Phil Krylov]

Hi, 

This patch fixes bug #4452.

ChangeLog:

riched20: Fixed crash when the window procedure is called with NULL hWnd.

---

 dlls/riched20/editor.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

4bfac23c946f54c41d8fe70de8e0160d8159ab40
diff --git a/dlls/riched20/editor.c b/dlls/riched20/editor.c
index 506c706..bb3767f 100644
--- a/dlls/riched20/editor.c
+++ b/dlls/riched20/editor.c
@@ -1287,7 +1287,12 @@ LRESULT WINAPI RichEditANSIWndProc(HWND 
   
   TRACE("hWnd %p msg %04x (%s) %08x %08lx\n",
         hWnd, msg, get_msg_name(msg), wParam, lParam);
-  
+
+  /* Some buggy subclassed window procedures call the original procedure
+   * with NULL hWnd */
+  if (!hWnd)
+    return 0;
+
   switch(msg) {
   
   UNSUPPORTED_MSG(EM_DISPLAYBAND)
-- 
1.1.6