From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Tue, 30 Aug 2011 01:16:23 +0000 (-0400)
Subject: Fix range of sem_count
X-Git-Tag: v1.9.1~210
X-Git-Url: http://git.liburcu.org/?a=commitdiff_plain;h=56cd7e2fe3fd32cb212d0e7976a6bae09ff4948c;p=lttng-ust.git

Fix range of sem_count

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/libust/lttng-ust-comm.c b/libust/lttng-ust-comm.c
index 9400b6b8..c5a3064a 100644
--- a/libust/lttng-ust-comm.c
+++ b/libust/lttng-ust-comm.c
@@ -217,6 +217,9 @@ int handle_register_done(struct sock_info *sock_info)
 	if (sock_info->constructor_sem_posted)
 		return 0;
 	sock_info->constructor_sem_posted = 1;
+	if (uatomic_read(&sem_count) <= 0) {
+		return 0;
+	}
 	ret = uatomic_add_return(&sem_count, -1);
 	if (ret == 0) {
 		ret = sem_post(&constructor_wait);