From: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Date: Tue, 11 Sep 2018 00:09:11 +0000 (-0400)
Subject: Fix: double put on error path
X-Git-Tag: v2.9.11~12
X-Git-Url: http://git.liburcu.org/?p=lttng-tools.git;a=commitdiff_plain;h=695f8ee100ee631ac103456c78dc77af8aff3f3b

Fix: double put on error path

Let relay_index_try_flush be responsible for the self-reference put on
error path.

Code flow of relay_index_try_flush is a bit tricky but the only error
flow (via relay_index_file_write) will always mark the index as flushed
and perform the self-reference put.

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---

diff --git a/src/bin/lttng-relayd/main.c b/src/bin/lttng-relayd/main.c
index 4f368ddac..238d20431 100644
--- a/src/bin/lttng-relayd/main.c
+++ b/src/bin/lttng-relayd/main.c
@@ -2045,8 +2045,13 @@ static int relay_recv_index(struct lttcomm_relayd_hdr *recv_hdr,
 		/* no flush. */
 		ret = 0;
 	} else {
+		/*
+		 * ret < 0
+		 *
+		 * relay_index_try_flush is responsible for the self-reference
+		 * put of the index object on error.
+		 */
 		ERR("relay_index_try_flush error %d", ret);
-		relay_index_put(index);
 		ret = -1;
 	}
 
@@ -2246,9 +2251,13 @@ static int handle_index_data(struct relay_stream *stream, uint64_t net_seq_num,
 		/* No flush. */
 		ret = 0;
 	} else {
-		/* Put self-ref for this index due to error. */
-		relay_index_put(index);
-		index = NULL;
+		/*
+		 * ret < 0
+		 *
+		 * relay_index_try_flush is responsible for the self-reference
+		 * put of the index object on error.
+		 */
+		ERR("relay_index_try_flush error %d", ret);
 		ret = -1;
 	}
 end: