qom: Avoid leaking str and bool properties on failure

When object_property_add_str() and object_property_add_bool() fail, they
leak their internal StringProperty and BoolProperty structs.  Remember
to free the structs on error.

Luckily this is a low-impact memory leak since most QOM properties are
static qdev properties that will never take the error case.
object_property_add() only fails if the property name is already in use.
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: NAndreas Färber <afaerber@suse.de>

qom/object.c

@@ -1293,6 +1293,7 @@ void object_property_add_str(Object *obj, const char *name,
                            void (*set)(Object *, const char *, Error **),
                            Error **errp)
 {
+    Error *local_err = NULL;
     StringProperty *prop = g_malloc0(sizeof(*prop));
 
     prop->get = get;
@@ -1302,7 +1303,11 @@ void object_property_add_str(Object *obj, const char *name,
                         get ? property_get_str : NULL,
                         set ? property_set_str : NULL,
                         property_release_str,
-                        prop, errp);
+                        prop, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        g_free(prop);
+    }
 }
 
 typedef struct BoolProperty
@@ -1349,6 +1354,7 @@ void object_property_add_bool(Object *obj, const char *name,
                               void (*set)(Object *, bool, Error **),
                               Error **errp)
 {
+    Error *local_err = NULL;
     BoolProperty *prop = g_malloc0(sizeof(*prop));
 
     prop->get = get;
@@ -1358,7 +1364,11 @@ void object_property_add_bool(Object *obj, const char *name,
                         get ? property_get_bool : NULL,
                         set ? property_set_bool : NULL,
                         property_release_bool,
-                        prop, errp);
+                        prop, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        g_free(prop);
+    }
 }
 
 static char *qdev_get_type(Object *obj, Error **errp)