[PATCH] riched20: Return E_INVALIDARG from ITextServices::TxGetText on null output.

[Jactry Zeng]

Signed-off-by: Jactry Zeng 
---
 dlls/riched20/tests/txtsrv.c | 3 +++
 dlls/riched20/txtsrv.c       | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/dlls/riched20/tests/txtsrv.c b/dlls/riched20/tests/txtsrv.c
index 73ca7cd753..5f261889f7 100644
--- a/dlls/riched20/tests/txtsrv.c
+++ b/dlls/riched20/tests/txtsrv.c
@@ -652,6 +652,9 @@ static void test_TxGetText(void)
     if (!init_texthost(&txtserv, &host))
         return;

+    hres = ITextServices_TxGetText(txtserv, NULL);
+    ok(hres == E_INVALIDARG, "ITextServices_TxGetText should fail (result = %x)\n", hres);
+
     hres = ITextServices_TxGetText(txtserv, &rettext);
     ok(hres == S_OK, "ITextServices_TxGetText failed (result = %x)\n", hres);

diff --git a/dlls/riched20/txtsrv.c b/dlls/riched20/txtsrv.c
index eb61e4eff6..8e9737e4a1 100644
--- a/dlls/riched20/txtsrv.c
+++ b/dlls/riched20/txtsrv.c
@@ -261,6 +261,9 @@ DECLSPEC_HIDDEN HRESULT WINAPI fnTextSrv_TxGetText(ITextServices *iface, BSTR *p
    ITextServicesImpl *This = impl_from_ITextServices(iface);
    int length;

+   if (!pbstrText)
+       return E_INVALIDARG;
+
    length = ME_GetTextLength(This->editor);
    if (length)
    {