From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Mon, 29 Mar 2021 16:17:12 +0000 (-0400)
Subject: Fix: sessiond: kernel: close on badfd on initialization error
X-Git-Tag: v2.13.0-rc1~177
X-Git-Url: http://git.lttng.org./?a=commitdiff_plain;h=6dcf80d3521804571f64844853d976d6fe16ebc7;p=lttng-tools.git

Fix: sessiond: kernel: close on badfd on initialization error

The various kernel tracer file descriptors are closed during an
initialization error, but are not set to `-1` which causes them to
be closed again when the session daemon performs its clean-up.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I11d3ce7accea51394c34b9ca7ea0445e4ee422fc
---

diff --git a/src/bin/lttng-sessiond/kernel.c b/src/bin/lttng-sessiond/kernel.c
index eebe119d2..b431b3dfb 100644
--- a/src/bin/lttng-sessiond/kernel.c
+++ b/src/bin/lttng-sessiond/kernel.c
@@ -2036,6 +2036,7 @@ error_version:
 		PERROR("Failed to close kernel tracer file descriptor: fd = %d",
 				kernel_tracer_fd);
 	}
+
 	kernel_tracer_fd = -1;
 	return LTTNG_ERR_KERN_VERSION;
 
@@ -2047,6 +2048,8 @@ error_token_ht:
 				kernel_tracer_event_notifier_group_notification_fd);
 	}
 
+	kernel_tracer_event_notifier_group_notification_fd = -1;
+
 error_modules:
 	ret = close(kernel_tracer_event_notifier_group_fd);
 	if (ret) {
@@ -2054,12 +2057,16 @@ error_modules:
 				kernel_tracer_event_notifier_group_fd);
 	}
 
+	kernel_tracer_event_notifier_group_fd = -1;
+
 	ret = close(kernel_tracer_fd);
 	if (ret) {
 		PERROR("Failed to close kernel tracer file descriptor: fd = %d",
 				kernel_tracer_fd);
 	}
 
+	kernel_tracer_fd = -1;
+
 error_open:
 	modprobe_remove_lttng_control();