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qapi: protect against NULL QObject in qmp_input_get_object

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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 <anthony@codemonkey.ws>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Paolo Bonzini 2011-12-18 17:05:04 +01:00 committed by Anthony Liguori
parent b1746dddfc
commit 47c6d3ecdf
1 changed files with 6 additions and 4 deletions
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2
qapi/qmp-input-visitor.c
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@ -49,11 +49,13 @@ static const QObject *qmp_input_get_object(QmpInputVisitor *qiv,
qobj = qiv->stack[qiv->nb_stack - 1].obj;
}
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;
}