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

[Phil Krylov]

Hi,

This fixes bug 4452.

ChangeLog:

Fixed crash when the rich edit window procedure is called with NULL hWnd from
some braindead subclassed window procedures.

---

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

f0345bcfdd038733ae03782ff41f597aef27154f
diff --git a/dlls/riched20/editor.c b/dlls/riched20/editor.c
index da5e996..1e04ece 100644
--- a/dlls/riched20/editor.c
+++ b/dlls/riched20/editor.c
@@ -1170,7 +1170,12 @@ LRESULT WINAPI RichEditANSIWndProc(HWND 
   
   TRACE("hWnd %p msg %04x (%s) %08x %08lx\n",
         hWnd, msg, get_msg_name(msg), wParam, lParam);
-  
+
+  /* Some braindead subclassed window procedures call the original procedure
+   * with NULL hWnd */
+  if (!hWnd)
+    return 0;
+
   switch(msg) {
   
   UNSUPPORTED_MSG(EM_AUTOURLDETECT)
-- 
1.0.GIT