qobject: Protect against use-after-free in qobject_decref()

Adding an assertion to qobject_decref() will ensure that a
programming error causing use-after-free will result in
immediate failure (provided no other thread has started
using the memory) instead of silently attempting to wrap
refcnt around and leaving the problem to potentially bite
later at a harder point to diagnose.

Suggested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1446791754-23823-4-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

diff --git a/include/qapi/qmp/qobject.h b/include/qapi/qmp/qobject.h
index c856f55..4b96ed5 100644 (file)
--- a/include/qapi/qmp/qobject.h
+++ b/include/qapi/qmp/qobject.h
@@ -90,6 +90,7 @@ static inline void qobject_incref(QObject *obj)
  */
 static inline void qobject_decref(QObject *obj)
 {
+    assert(!obj || obj->refcnt);
     if (obj && --obj->refcnt == 0) {
         assert(obj->type != NULL);
         assert(obj->type->destroy != NULL);