From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Tue, 21 Jul 2020 16:44:59 +0000 (-0400)
Subject: Fix: consumerd: double unlock on rotate channel error path
X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=commitdiff_plain;h=7a86c13d20ba17a39767f808e6f0ea363430eeda

Fix: consumerd: double unlock on rotate channel error path

Coverity Scan reports:
  1430541 Double unlock

  May result in undefined behavior.

  In lttng_consumer_rotate_channel: Attempt to release a non-recursive
  lock that is not held (CWE-765)

The error path should jump to end_unlock_channel as the stream
lock is only held for the duration of the call to
consumer_stream_open_packet.

This bug was introduced by the previous commit.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I2de684eece963973d0861e5924263575363484f6
---

diff --git a/src/common/consumer/consumer.c b/src/common/consumer/consumer.c
index 4a8b14634..d45771e7e 100644
--- a/src/common/consumer/consumer.c
+++ b/src/common/consumer/consumer.c
@@ -4207,7 +4207,7 @@ int lttng_consumer_rotate_channel(struct lttng_consumer_channel *channel,
 		case CONSUMER_STREAM_OPEN_PACKET_STATUS_ERROR:
 			/* Logged by callee. */
 			ret = -1;
-			goto end_unlock_stream;
+			goto end_unlock_channel;
 		default:
 			abort();
 		}