James Hawkins : hhctrl.ocx: Check the filename param before dereferencing it.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 9f42e8eb63d5b69fd800c721972df21991b7fb1f
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=9f42e8eb63d5b69fd800c721972df21991b7fb1f

Author: James Hawkins <jhawkins at codeweavers.com>
Date:   Tue May 20 00:40:27 2008 -0500

hhctrl.ocx: Check the filename param before dereferencing it.

---

 dlls/hhctrl.ocx/hhctrl.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/dlls/hhctrl.ocx/hhctrl.c b/dlls/hhctrl.ocx/hhctrl.c
index a555a42..a224b64 100644
--- a/dlls/hhctrl.ocx/hhctrl.c
+++ b/dlls/hhctrl.ocx/hhctrl.c
@@ -108,6 +108,9 @@ HWND WINAPI HtmlHelpW(HWND caller, LPCWSTR filename, UINT command, DWORD_PTR dat
 
         FIXME("Not all HH cases handled correctly\n");
 
+        if (!filename)
+            return NULL;
+
         index = strstrW(filename, delimW);
         if (index)
         {
@@ -141,6 +144,9 @@ HWND WINAPI HtmlHelpW(HWND caller, LPCWSTR filename, UINT command, DWORD_PTR dat
         HHInfo *info;
         LPWSTR url;
 
+        if (!filename)
+            return NULL;
+
         info = CreateHelpViewer(filename);
         if(!info)
             return NULL;