From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Tue, 14 Jun 2022 16:01:22 +0000 (-0400)
Subject: Fix: sessiond: registry_channel: initialize _rcu_head and _node
X-Git-Url: https://git.liburcu.org/?p=lttng-tools.git;a=commitdiff_plain;h=36038679a47861ffc7e937ea6446d6ca3805b109

Fix: sessiond: registry_channel: initialize _rcu_head and _node

1490020 Uninitialized pointer field
The pointer field will point to an arbitrary memory location, any
attempt to write may cause corruption.

In lttng::​sessiond::​ust::​registry_channel::​registry_channel(unsigned int, std::​function<void (lttng::​sessiond::​ust::​registry_channel const &)>, std::​function<void (lttng::​sessiond::​ust::​registry_channel const &, lttng::​sessiond::​ust::​registry_event const &)>): A pointer field is not initialized in the constructor (CWE-457)

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ie043af750941a02a65ba69e70fe2620349989398
---

diff --git a/src/bin/lttng-sessiond/ust-registry-channel.cpp b/src/bin/lttng-sessiond/ust-registry-channel.cpp
index a2a1707dc..e7fe73971 100644
--- a/src/bin/lttng-sessiond/ust-registry-channel.cpp
+++ b/src/bin/lttng-sessiond/ust-registry-channel.cpp
@@ -99,6 +99,13 @@ lsu::registry_channel::registry_channel(unsigned int channel_id,
 	/* Set custom match function. */
 	_events->match_fct = ht_match_event;
 	_events->hash_fct = ht_hash_event;
+
+	_rcu_head = {};
+	/*
+	 * Node's key is initialized by the channel's parent session. Its value is irrelevant to the
+	 * channel object itself.
+	 */
+	_node = {};
 }
 
 void lsu::registry_channel::add_event(