A NULL qobj can occur when a parameter is fetched via qdict_get, but
the parameter is not in the command. By returning NULL, the caller can
choose whether to raise a missing parameter error, an invalid parameter
type error, or use a default value. For example, qom-set could can
use this to reset a property to its default value, though at this time
it will fail with "Invalid parameter type". In any case, anything is
better than crashing!
Reviewed-by: Anthony Liguori <anth...@codemonkey.ws>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
qapi/qmp-input-visitor.c | 10 ++++++----
1 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/qapi/qmp-input-visitor.c b/qapi/qmp-input-visitor.c
index 8cbc0ab..c78022b 100644
--- a/qapi/qmp-input-visitor.c
+++ b/qapi/qmp-input-visitor.c
@@ -49,10 +49,12 @@ static const QObject *qmp_input_get_object(QmpInputVisitor
*qiv,
qobj = qiv->stack[qiv->nb_stack - 1].obj;
}
- if (name && qobject_type(qobj) == QTYPE_QDICT) {
- return qdict_get(qobject_to_qdict(qobj), name);
- } else if (qiv->nb_stack > 0 && qobject_type(qobj) == QTYPE_QLIST) {
- return qlist_entry_obj(qiv->stack[qiv->nb_stack - 1].entry);
+ if (qobj) {
+ if (name && qobject_type(qobj) == QTYPE_QDICT) {
+ return qdict_get(qobject_to_qdict(qobj), name);
+ } else if (qiv->nb_stack > 0 && qobject_type(qobj) == QTYPE_QLIST) {
+ return qlist_entry_obj(qiv->stack[qiv->nb_stack - 1].entry);
+ }
}
return qobj;
--
1.7.7.1
