Jacek Caban : msxml3: Fix string length handling in I[VB]SAXContentHandler ::characters.
Module: wine Branch: master Commit: 73af53c4bca6cc56b4fccc8139cc564715c08e99 URL: https://source.winehq.org/git/wine.git/?a=commit;h=73af53c4bca6cc56b4fccc813... Author: Jacek Caban <jacek(a)codeweavers.com> Date: Tue Jun 18 16:55:40 2019 +0200 msxml3: Fix string length handling in I[VB]SAXContentHandler::characters. Windows crashes when -1 length is passed. Escaping should just copy embedded null bytes. Signed-off-by: Jacek Caban <jacek(a)codeweavers.com> Signed-off-by: Nikolay Sivov <nsivov(a)codeweavers.com> Signed-off-by: Alexandre Julliard <julliard(a)winehq.org> --- dlls/msxml3/mxwriter.c | 10 +++--- dlls/msxml3/tests/saxreader.c | 72 ++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 76 insertions(+), 6 deletions(-) diff --git a/dlls/msxml3/mxwriter.c b/dlls/msxml3/mxwriter.c index 10be250..a5bfdf1 100644 --- a/dlls/msxml3/mxwriter.c +++ b/dlls/msxml3/mxwriter.c @@ -498,10 +498,10 @@ static WCHAR *get_escaped_string(const WCHAR *str, escape_mode mode, int *len) WCHAR *ptr, *ret; /* default buffer size to something if length is unknown */ - conv_len = *len == -1 ? default_alloc : max(2**len, default_alloc); + conv_len = max(2**len, default_alloc); ptr = ret = heap_alloc(conv_len*sizeof(WCHAR)); - while (*str && p) + while (p) { if (ptr - ret > conv_len - grow_thresh) { @@ -539,10 +539,10 @@ static WCHAR *get_escaped_string(const WCHAR *str, escape_mode mode, int *len) } str++; - if (*len != -1) p--; + p--; } - if (*len != -1) *len = ptr-ret; + *len = ptr-ret; *++ptr = 0; return ret; @@ -2206,7 +2206,7 @@ static HRESULT WINAPI VBSAXContentHandler_characters(IVBSAXContentHandler *iface if (!chars) return E_POINTER; - return ISAXContentHandler_characters(&This->ISAXContentHandler_iface, *chars, -1); + return ISAXContentHandler_characters(&This->ISAXContentHandler_iface, *chars, SysStringLen(*chars)); } static HRESULT WINAPI VBSAXContentHandler_ignorableWhitespace(IVBSAXContentHandler *iface, BSTR *chars) diff --git a/dlls/msxml3/tests/saxreader.c b/dlls/msxml3/tests/saxreader.c index eeef5b6..d1076f5 100644 --- a/dlls/msxml3/tests/saxreader.c +++ b/dlls/msxml3/tests/saxreader.c @@ -3950,10 +3950,13 @@ static const struct writer_characters_t writer_characters[] = { static void test_mxwriter_characters(void) { static const WCHAR chardataW[] = {'T','E','S','T','C','H','A','R','D','A','T','A',' ','.',0}; + static const WCHAR embedded_nullbytes[] = {'a',0,'b',0,0,0,'c',0}; const struct writer_characters_t *table = writer_characters; + IVBSAXContentHandler *vb_content; ISAXContentHandler *content; IMXWriter *writer; VARIANT dest; + BSTR str; HRESULT hr; int i = 0; @@ -3964,6 +3967,9 @@ static void test_mxwriter_characters(void) hr = IMXWriter_QueryInterface(writer, &IID_ISAXContentHandler, (void**)&content); EXPECT_HR(hr, S_OK); + hr = IMXWriter_QueryInterface(writer, &IID_IVBSAXContentHandler, (void**)&vb_content); + EXPECT_HR(hr, S_OK); + hr = IMXWriter_put_omitXMLDeclaration(writer, VARIANT_TRUE); EXPECT_HR(hr, S_OK); @@ -3976,6 +3982,10 @@ static void test_mxwriter_characters(void) hr = ISAXContentHandler_characters(content, chardataW, 0); EXPECT_HR(hr, S_OK); + str = _bstr_("VbChars"); + hr = IVBSAXContentHandler_characters(vb_content, &str); + EXPECT_HR(hr, S_OK); + hr = ISAXContentHandler_characters(content, chardataW, ARRAY_SIZE(chardataW) - 1); EXPECT_HR(hr, S_OK); @@ -3983,13 +3993,14 @@ static void test_mxwriter_characters(void) hr = IMXWriter_get_output(writer, &dest); EXPECT_HR(hr, S_OK); ok(V_VT(&dest) == VT_BSTR, "got %d\n", V_VT(&dest)); - ok(!lstrcmpW(_bstr_("TESTCHARDATA ."), V_BSTR(&dest)), "got wrong content %s\n", wine_dbgstr_w(V_BSTR(&dest))); + ok(!lstrcmpW(_bstr_("VbCharsTESTCHARDATA ."), V_BSTR(&dest)), "got wrong content %s\n", wine_dbgstr_w(V_BSTR(&dest))); VariantClear(&dest); hr = ISAXContentHandler_endDocument(content); EXPECT_HR(hr, S_OK); ISAXContentHandler_Release(content); + IVBSAXContentHandler_Release(vb_content); IMXWriter_Release(writer); /* try empty characters data to see if element is closed */ @@ -4025,6 +4036,65 @@ static void test_mxwriter_characters(void) ISAXContentHandler_Release(content); IMXWriter_Release(writer); + /* test embedded null bytes */ + hr = CoCreateInstance(&CLSID_MXXMLWriter, NULL, CLSCTX_INPROC_SERVER, + &IID_IMXWriter, (void**)&writer); + EXPECT_HR(hr, S_OK); + + hr = IMXWriter_QueryInterface(writer, &IID_ISAXContentHandler, (void**)&content); + EXPECT_HR(hr, S_OK); + + hr = IMXWriter_put_omitXMLDeclaration(writer, VARIANT_TRUE); + EXPECT_HR(hr, S_OK); + + hr = ISAXContentHandler_startDocument(content); + EXPECT_HR(hr, S_OK); + + hr = ISAXContentHandler_characters(content, embedded_nullbytes, ARRAY_SIZE(embedded_nullbytes)); + EXPECT_HR(hr, S_OK); + + V_VT(&dest) = VT_EMPTY; + hr = IMXWriter_get_output(writer, &dest); + EXPECT_HR(hr, S_OK); + ok(V_VT(&dest) == VT_BSTR, "got %d\n", V_VT(&dest)); + ok(SysStringLen(V_BSTR(&dest)) == ARRAY_SIZE(embedded_nullbytes), "unexpected len %d\n", SysStringLen(V_BSTR(&dest))); + ok(!memcmp(V_BSTR(&dest), embedded_nullbytes, ARRAY_SIZE(embedded_nullbytes)), + "got wrong content %s\n", wine_dbgstr_w(V_BSTR(&dest))); + VariantClear(&dest); + + ISAXContentHandler_Release(content); + IMXWriter_Release(writer); + + hr = CoCreateInstance(&CLSID_MXXMLWriter, NULL, CLSCTX_INPROC_SERVER, + &IID_IMXWriter, (void**)&writer); + EXPECT_HR(hr, S_OK); + + hr = IMXWriter_QueryInterface(writer, &IID_IVBSAXContentHandler, (void**)&vb_content); + EXPECT_HR(hr, S_OK); + + hr = IMXWriter_put_omitXMLDeclaration(writer, VARIANT_TRUE); + EXPECT_HR(hr, S_OK); + + hr = IVBSAXContentHandler_startDocument(vb_content); + EXPECT_HR(hr, S_OK); + + str = SysAllocStringLen(embedded_nullbytes, ARRAY_SIZE(embedded_nullbytes)); + hr = IVBSAXContentHandler_characters(vb_content, &str); + EXPECT_HR(hr, S_OK); + SysFreeString(str); + + V_VT(&dest) = VT_EMPTY; + hr = IMXWriter_get_output(writer, &dest); + EXPECT_HR(hr, S_OK); + ok(V_VT(&dest) == VT_BSTR, "got %d\n", V_VT(&dest)); + ok(SysStringLen(V_BSTR(&dest)) == ARRAY_SIZE(embedded_nullbytes), "unexpected len %d\n", SysStringLen(V_BSTR(&dest))); + ok(!memcmp(V_BSTR(&dest), embedded_nullbytes, ARRAY_SIZE(embedded_nullbytes)), + "got wrong content %s\n", wine_dbgstr_w(V_BSTR(&dest))); + VariantClear(&dest); + + IVBSAXContentHandler_Release(vb_content); + IMXWriter_Release(writer); + /* batch tests */ while (table->clsid) {
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Alexandre Julliard