Re: [Qemu-devel] [PATCH 2/3] qapi: clear given pointer

[Markus Armbruster <armbru@redhat.com>]

Marc-André Lureau <marcandre.lureau@redhat.com> writes:

> Some getters already set *obj argument to NULL early, let's do this for
> all for consistent behaviour in case of errors.
>
> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> ---
>  qapi/qmp-input-visitor.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/qapi/qmp-input-visitor.c b/qapi/qmp-input-visitor.c
> index ea9972d..cb9d196 100644
> --- a/qapi/qmp-input-visitor.c
> +++ b/qapi/qmp-input-visitor.c
> @@ -322,11 +322,13 @@ static void qmp_input_type_str(Visitor *v, const char *name, char **obj,
>      QObject *qobj = qmp_input_get_object(qiv, name, true, errp);
>      QString *qstr = qobject_to_qstring(qobj);
>  
> +    if (obj) {
> +        *obj = NULL;
> +    }
>      if (!qobj) {
>          return;
>      }
>      if (!qstr) {
> -        *obj = NULL;
>          error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
>                     "string");
>          return;

This undoes damage done in PATCH 1.

> @@ -368,6 +370,9 @@ static void qmp_input_type_any(Visitor *v, const char *name, QObject **obj,
>      QmpInputVisitor *qiv = to_qiv(v);
>      QObject *qobj = qmp_input_get_object(qiv, name, true, errp);
>  
> +    if (obj) {
> +        *obj = NULL;
> +    }
>      if (!qobj) {
>          return;
>      }

Likewise.

Similar damage done to qmp_input_start_list() and possibly others.
Please squash into PATCH 1 and double-check your new error returns affect
*obj like the existing ones.