A NULL value is not added to visitor's stack, but there
is no check for that when the visitor tries to return
that value, leading to Qemu crash.
Reviewed-by: Eric Blake <ebl...@redhat.com>
Signed-off-by: Marcel Apfelbaum <marce...@redhat.com>
---
qapi/qmp-output-visitor.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/qapi/qmp-output-visitor.c b/qapi/qmp-output-visitor.c
index 74a5684..0562f49 100644
--- a/qapi/qmp-output-visitor.c
+++ b/qapi/qmp-output-visitor.c
@@ -66,6 +66,11 @@ static QObject *qmp_output_pop(QmpOutputVisitor *qov)
static QObject *qmp_output_first(QmpOutputVisitor *qov)
{
QStackEntry *e = QTAILQ_LAST(&qov->stack, QStack);
+
+ if (!e) {
+ return NULL;
+ }
+
return e->value;
}
--
1.8.3.1
