[PATCH] msxml3: return S_FALSE from IXMLDOMNamedNodeMap::nextNode() when there are no attributes

[Damjan Jovanovic]

Currently Wine return S_FALSE when IXMLDOMNamedNodeMap::nextNode()
has run out of attributes to return, but when an XML node has no
attributes at all, it returns S_OK despite setting the nextNode
output parameter to NULL, causing the caller to crash when it
accesses this pointer. Return S_FALSE in this case instead.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=50603
Signed-off-by: Damjan Jovanovic <damjan.jov at gmail.com>
---
 dlls/msxml3/element.c      |  2 ++
 dlls/msxml3/tests/domdoc.c | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+)
-------------- next part --------------
diff --git a/dlls/msxml3/element.c b/dlls/msxml3/element.c
index 5891653a76f..1a523798328 100644
--- a/dlls/msxml3/element.c
+++ b/dlls/msxml3/element.c
@@ -1890,6 +1890,8 @@ static HRESULT domelem_next_node(const xmlNodePtr node, LONG *iter, IXMLDOMNode
     *nextNode = NULL;
 
     curr = node->properties;
+    if (curr == NULL)
+        return S_FALSE;
 
     for (i = 0; i < *iter; i++) {
         if (curr->next == NULL)
diff --git a/dlls/msxml3/tests/domdoc.c b/dlls/msxml3/tests/domdoc.c
index b1f172e3faa..df30104a156 100644
--- a/dlls/msxml3/tests/domdoc.c
+++ b/dlls/msxml3/tests/domdoc.c
@@ -2205,6 +2205,8 @@ static void test_domnode( void )
 
     if (element)
     {
+        IXMLDOMNamedNodeMap *attributes;
+
         owner = NULL;
         r = IXMLDOMElement_get_ownerDocument( element, &owner );
         ok( r == S_OK, "get_ownerDocument return code\n");
@@ -2283,6 +2285,29 @@ static void test_domnode( void )
         ok( map != NULL, "should be attributes\n");
 
         EXPECT_CHILDREN(element);
+
+        r = IXMLDOMElement_get_childNodes( element, &list );
+        ok( r == S_OK, "Expected S_OK, ret %08x\n", r );
+        r = IXMLDOMNodeList_nextNode( list, &node ); /* <bs> */
+        ok( r == S_OK, "Expected S_OK, ret %08x\n", r );
+        IXMLDOMNode_Release( node );
+        r = IXMLDOMNodeList_nextNode( list, &node ); /* <pr> */
+        ok( r == S_OK, "Expected S_OK, ret %08x\n", r );
+        IXMLDOMNode_Release( node );
+        r = IXMLDOMNodeList_nextNode( list, &node ); /* <empty> */
+        ok( r == S_OK, "Expected S_OK, ret %08x\n", r );
+        r = IXMLDOMNode_get_attributes( node, &attributes );
+        ok( r == S_OK, "Expected S_OK, ret %08x\n", r );
+        next = (IXMLDOMNode*)0xdeadbeef;
+        r = IXMLDOMNamedNodeMap_nextNode( attributes, &next );
+        ok( r == S_FALSE, "Expected S_FALSE, ret %08x\n", r );
+        ok( next == NULL, "Expected NULL, ret %p\n", next );
+        IXMLDOMNamedNodeMap_Release( attributes );
+        IXMLDOMNode_Release( node );
+        node = NULL;
+        next = NULL;
+        IXMLDOMNodeList_Release( list );
+        list = NULL;
     }
     else
         ok( FALSE, "no element\n");