Alexandre Julliard : explorer: Avoid crashing when the desktop launchers are not initialized.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 0d40cdc7796d1e688a0c80576b313aeda13198f8
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=0d40cdc7796d1e688a0c80576b313aeda13198f8

Author: Alexandre Julliard <julliard at winehq.org>
Date:   Fri Oct 18 13:29:39 2013 +0200

explorer: Avoid crashing when the desktop launchers are not initialized.

---

 programs/explorer/desktop.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/programs/explorer/desktop.c b/programs/explorer/desktop.c
index 4c38edb..3ea3e60 100644
--- a/programs/explorer/desktop.c
+++ b/programs/explorer/desktop.c
@@ -88,8 +88,10 @@ static RECT get_title_rect( unsigned int index )
 static const struct launcher *launcher_from_point( int x, int y )
 {
     RECT icon, title;
-    unsigned int index = x / launcher_size + (y / launcher_size) * launchers_per_row;
+    unsigned int index;
 
+    if (!nb_launchers) return NULL;
+    index = x / launcher_size + (y / launcher_size) * launchers_per_row;
     if (index >= nb_launchers) return NULL;
 
     icon = get_icon_rect( index );
@@ -523,6 +525,7 @@ static LRESULT WINAPI desktop_wnd_proc( HWND hwnd, UINT message, WPARAM wp, LPAR
         return 0;
 
     case WM_LBUTTONDBLCLK:
+        if (!using_root)
         {
             const struct launcher *launcher = launcher_from_point( (short)LOWORD(lp), (short)HIWORD(lp) );
             if (launcher) do_launch( launcher );