From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Tue, 18 Nov 2014 14:35:48 +0000 (-0500)
Subject: Fix: Missing rcu_read_lock in get_session_max_subbuf_size()
X-Git-Tag: v2.5.3~39
X-Git-Url: https://git.lttng.org/?a=commitdiff_plain;h=3230567ae6d2e19db03279369f9e6b34a54dc7f5;p=lttng-tools.git

Fix: Missing rcu_read_lock in get_session_max_subbuf_size()

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

diff --git a/src/bin/lttng-sessiond/cmd.c b/src/bin/lttng-sessiond/cmd.c
index 84de27770..a4e39f264 100644
--- a/src/bin/lttng-sessiond/cmd.c
+++ b/src/bin/lttng-sessiond/cmd.c
@@ -2978,12 +2978,14 @@ static uint64_t get_session_max_subbuf_size(struct ltt_session *session)
 		struct ltt_ust_channel *uchan;
 		struct ltt_ust_session *usess = session->ust_session;
 
+		rcu_read_lock();
 		cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
 				uchan, node.node) {
 			if (uchan->attr.subbuf_size > max_size) {
 				max_size = uchan->attr.subbuf_size;
 			}
 		}
+		rcu_read_unlock();
 	}
 
 	return max_size;