commit 7f0278435df1fa845b3bd9556942f89296d4246b
author Markus Armbruster <armbru@redhat.com> Thu Oct 15 16:15:37 2015 +0200
committer Markus Armbruster <armbru@redhat.com> Thu Oct 29 14:34:45 2015 +0100
tree ad364ba05fbd93e34fff0e52ac3ae35c351ea4bb
parent 2d6421a90047a83f6722832405fe09571040ea5b

qstring: Make conversion from QObject * accept null

qobject_to_qstring() crashes on null, which is a trap for the unwary.
Return null instead, and simplify a few callers.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1444918537-18107-7-git-send-email-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>

qapi/qmp-input-visitor.c

diff --git a/qapi/qmp-input-visitor.c b/qapi/qmp-input-visitor.c
index 267783c..eb6e110 100644
--- a/qapi/qmp-input-visitor.c
+++ b/qapi/qmp-input-visitor.c
@@ -255,15 +255,15 @@
                                Error **errp)
 {
     QmpInputVisitor *qiv = to_qiv(v);
-    QObject *qobj = qmp_input_get_object(qiv, name, true);
+    QString *qstr = qobject_to_qstring(qmp_input_get_object(qiv, name, true));
 
-    if (!qobj || qobject_type(qobj) != QTYPE_QSTRING) {
+    if (!qstr) {
         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
                    "string");
         return;
     }
 
-    *obj = g_strdup(qstring_get_str(qobject_to_qstring(qobj)));
+    *obj = g_strdup(qstring_get_str(qstr));
 }
 
 static void qmp_input_type_number(Visitor *v, double *obj, const char *name,