wldap32: Handle null LDAPMessage in ldap_parse_result.

dlls/wldap32/parse.c

@@ -148,6 +148,7 @@ ULONG CDECL ldap_parse_resultA( LDAP *ld, WLDAP32_LDAPMessage *result, ULONG *re
            free );
 
     if (!ld) return WLDAP32_LDAP_PARAM_ERROR;
+    if (!result) return WLDAP32_LDAP_NO_RESULTS_RETURNED;
 
     ret = ldap_parse_resultW( ld, result, retcode, &matchedW, &errorW, &referralsW, &serverctrlsW, free );
 
@@ -177,6 +178,7 @@ ULONG CDECL ldap_parse_resultW( LDAP *ld, WLDAP32_LDAPMessage *result, ULONG *re
            free );
 
     if (!ld) return WLDAP32_LDAP_PARAM_ERROR;
+    if (!result) return WLDAP32_LDAP_NO_RESULTS_RETURNED;
 
     ret = map_error( ldap_parse_result( CTX(ld), MSG(result), (int *)retcode, &matchedU, &errorU, &referralsU,
                                         &serverctrlsU, free ) );

dlls/wldap32/tests/parse.c

@@ -68,6 +68,12 @@ static void test_ldap_parse_sort_control( LDAP *ld )
     ok( !ret, "ldap_search_ext_sA failed %#lx\n", ret );
     ok( res != NULL, "expected res != NULL\n" );
 
+    ret = ldap_parse_resultA( NULL, NULL, NULL, NULL, NULL, NULL, &server_ctrls, 0 );
+    ok( ret == LDAP_PARAM_ERROR, "ldap_parse_resultA should fail, got %#lx\n", ret );
+    ret = ldap_parse_resultA( NULL, res, NULL, NULL, NULL, NULL, &server_ctrls, 0 );
+    ok( ret == LDAP_PARAM_ERROR, "ldap_parse_resultA should fail, got %#lx\n", ret );
+    ret = ldap_parse_resultA( ld, NULL, NULL, NULL, NULL, NULL, &server_ctrls, 0 );
+    ok( ret == LDAP_NO_RESULTS_RETURNED, "ldap_parse_resultA should fail, got %#lx\n", ret );
     result = ~0u;
     ret = ldap_parse_resultA( ld, res, &result, NULL, NULL, NULL, &server_ctrls, 1 );
     ok( !ret, "ldap_parse_resultA failed %#lx\n", ret );