[PATCH 1/3] mshtml: Add a null parameter check in do_query_service().

[Zebediah Figura]

Signed-off-by: Zebediah Figura <zfigura at codeweavers.com>
---
 dlls/mshtml/main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dlls/mshtml/main.c b/dlls/mshtml/main.c
index af716d1680..43270b9cc8 100644
--- a/dlls/mshtml/main.c
+++ b/dlls/mshtml/main.c
@@ -190,6 +190,9 @@ HRESULT do_query_service(IUnknown *unk, REFGUID guid_service, REFIID riid, void
     IServiceProvider *sp;
     HRESULT hres;
 
+    if (!unk)
+        return E_FAIL;
+
     hres = IUnknown_QueryInterface(unk, &IID_IServiceProvider, (void**)&sp);
     if(FAILED(hres))
         return hres;
-- 
2.14.1