[PATCH] msxml3: Fix crashes due to access to invalid context pointer.

[Bernhard Übelacker]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52073
Signed-off-by: Bernhard Übelacker <bernhardu at mailbox.org>

----
Unchanged to previous [RFC].


In function xslt_doc_default_loader a pointer of the stack based
variable "xmlParserInputPtr input" is given to bind_url.

Later in function import_loader_onDataAvailable this pointer appears
as parameter "void *ctxt" which correctly gets casted to
"xmlParserInputPtr *input", but in my opinion incorrectly given
to xmlNewIOInputStream as parameter "xmlParserCtxtPtr ctxt".

In the next call to xmlNewInputStream this xmlParserCtxtPtr is
used to increment the input_id member.

By accident this input_id member contains the pointer which causes
in xmlXPathNodeCollectAndTest the segfault.
---
 dlls/msxml3/node.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/msxml3/node.c b/dlls/msxml3/node.c
index 721ad54e379..272e438e773 100644
--- a/dlls/msxml3/node.c
+++ b/dlls/msxml3/node.c
@@ -1329,7 +1329,7 @@ static HRESULT import_loader_onDataAvailable(void *ctxt, char *ptr, DWORD len)
 
     inputbuffer = xmlParserInputBufferCreateIO(import_loader_io_read, import_loader_io_close, buffer,
             XML_CHAR_ENCODING_NONE);
-    *input = xmlNewIOInputStream(ctxt, inputbuffer, XML_CHAR_ENCODING_NONE);
+    *input = xmlNewIOInputStream(NULL, inputbuffer, XML_CHAR_ENCODING_NONE);
     if (!*input)
         xmlFreeParserInputBuffer(inputbuffer);
 
-- 
2.34.1