Nikolay Sivov : oleaut32: Always reset return type for VarMod().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 5e9663c064cbfdc39dac885b1954d351141ee349
URL:    https://gitlab.winehq.org/wine/wine/-/commit/5e9663c064cbfdc39dac885b1954d35...

Author: Nikolay Sivov <nsivov(a)codeweavers.com>
Date:   Sun Nov 26 23:32:46 2023 +0100

oleaut32: Always reset return type for VarMod().

---

 dlls/oleaut32/tests/vartest.c | 7 +++++++
 dlls/oleaut32/variant.c       | 1 +
 2 files changed, 8 insertions(+)

diff --git a/dlls/oleaut32/tests/vartest.c b/dlls/oleaut32/tests/vartest.c
index c2b5b4113d7..4751070827c 100644
--- a/dlls/oleaut32/tests/vartest.c
+++ b/dlls/oleaut32/tests/vartest.c
@@ -3518,8 +3518,15 @@ static void test_Mod( int line, VARIANT *left, VARIANT *right, VARIANT *expected
     hres = pVarMod( left, right, &result );
     ok_(__FILE__,line)( hres == expres, "wrong result %lx/%lx\n", hres, expres );
     if (hres == S_OK)
+    {
         ok_(__FILE__,line)( is_expected_variant( &result, expected ),
                             "got %s expected %s\n", variantstr(&result), variantstr(expected) );
+    }
+    else
+    {
+        ok_(__FILE__,line)( V_VT(&result) == VT_EMPTY, "Unexpected type %d.\n", V_VT(&result) );
+        ok_(__FILE__,line)( V_I4(&result) == 0x12345, "Unexpected value %ld.\n", V_I4(&result) );
+    }
 }
 
 #define VARMOD(vt1,vt2,val1,val2,rvt,rval)               \
diff --git a/dlls/oleaut32/variant.c b/dlls/oleaut32/variant.c
index 9e1fefe9705..bb1e83e9b7e 100644
--- a/dlls/oleaut32/variant.c
+++ b/dlls/oleaut32/variant.c
@@ -5410,6 +5410,7 @@ HRESULT WINAPI VarMod(LPVARIANT left, LPVARIANT right, LPVARIANT result)
     VariantInit(&tempRight);
     VariantInit(&lv);
     VariantInit(&rv);
+    V_VT(result) = VT_EMPTY;
 
     TRACE("(%s,%s,%p)\n", debugstr_variant(left), debugstr_variant(right), result);