Alistair Leslie-Hughes : msxml3: IXMLDOMElement::selectSingleNode always assign a value to the output parameter.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 0770ba61ceb81794e5d03b6d6c48597d1b67c7ae
URL:    https://gitlab.winehq.org/wine/wine/-/commit/0770ba61ceb81794e5d03b6d6c48597...

Author: Alistair Leslie-Hughes <leslie_alistair(a)hotmail.com>
Date:   Tue Oct  3 17:08:16 2023 +1100

msxml3: IXMLDOMElement::selectSingleNode always assign a value to the output parameter.

---

 dlls/msxml3/node.c         | 3 +++
 dlls/msxml3/tests/domdoc.c | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/dlls/msxml3/node.c b/dlls/msxml3/node.c
index 339504477ac..4e4a9cfd1ef 100644
--- a/dlls/msxml3/node.c
+++ b/dlls/msxml3/node.c
@@ -1560,6 +1560,9 @@ HRESULT node_select_singlenode(const xmlnode *This, BSTR query, IXMLDOMNode **no
     IXMLDOMNodeList *list;
     HRESULT hr;
 
+    if (node)
+        *node = NULL;
+
     hr = node_select_nodes(This, query, &list);
     if (hr == S_OK)
     {
diff --git a/dlls/msxml3/tests/domdoc.c b/dlls/msxml3/tests/domdoc.c
index 582c3ba6621..b2cddb5d140 100644
--- a/dlls/msxml3/tests/domdoc.c
+++ b/dlls/msxml3/tests/domdoc.c
@@ -2516,6 +2516,11 @@ static void test_domnode( void )
         ok(hr == S_FALSE, "Unexpected hr %#lx.\n", hr);
         ok( node == NULL, "node %p\n", node );
 
+        node = (void*)0xdeadbeef;
+        hr = IXMLDOMElement_selectSingleNode( element, _bstr_("In Valid"), &node );
+        ok(hr == E_FAIL, "Unexpected hr %#lx.\n", hr);
+        ok( node == NULL, "node %p\n", node );
+
         str = SysAllocString(L"bs");
         hr = IXMLDOMElement_selectSingleNode( element, str, &node );
         SysFreeString(str);