From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Fri, 2 Apr 2021 17:11:34 +0000 (-0400)
Subject: Fix: sessiond: ust-app: assertion failure on registration of dead app
X-Git-Tag: v2.13.0-rc1~167
X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=commitdiff_plain;h=88631abdb47f19cef324197fee9b21718a307808

Fix: sessiond: ust-app: assertion failure on registration of dead app

While setting up the event notifier group of a newly registered
application (see `ust_app_setup_event_notifier_group()`), communications
with the application can fail (generally because the application exited)
while sending the error counter configuration. This causes the UST
handle to the event notifier group to be released.

However, a second release is performed which results in undefined
behaviour (I have seen it succeed, assert, and crash under different
circumstances) while disposing of the application (see
`delete_ust_app()`).

Set the event notifier group ust handle to NULL to mark it as invalid
and prevent a second release during the clean-up.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ia5623a8d3f57174effa51c278e9654b6adc43289
---

diff --git a/src/bin/lttng-sessiond/ust-app.c b/src/bin/lttng-sessiond/ust-app.c
index d8546308d..b5ee6126e 100644
--- a/src/bin/lttng-sessiond/ust-app.c
+++ b/src/bin/lttng-sessiond/ust-app.c
@@ -4070,6 +4070,7 @@ int ust_app_setup_event_notifier_group(struct ust_app *app)
 error:
 	ustctl_release_object(app->sock, app->event_notifier_group.object);
 	free(app->event_notifier_group.object);
+	app->event_notifier_group.object = NULL;
 	return ret;
 }