linux-kernel - [PATCH 1/4] perf cgroup: Fix leak of file reference count

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Date:	Thu, 03 Mar 2011 14:25:37 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/4] perf cgroup: Fix leak of file reference count

In perf_cgroup_connect(), fput_light() is missing in a failure
path.

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
---
 kernel/perf_event.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 64a018e..4a955fd 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -404,8 +404,10 @@ static inline int perf_cgroup_connect(int fd, struct perf_event *event,
 		return -EBADF;
 
 	css = cgroup_css_from_dir(file, perf_subsys_id);
-	if (IS_ERR(css))
-		return PTR_ERR(css);
+	if (IS_ERR(css)) {
+		ret = PTR_ERR(css);
+		goto out;
+	}
 
 	cgrp = container_of(css, struct perf_cgroup, css);
 	event->cgrp = cgrp;
@@ -422,6 +424,7 @@ static inline int perf_cgroup_connect(int fd, struct perf_event *event,
 		/* must be done before we fput() the file */
 		perf_get_cgroup(event);
 	}
+out:
 	fput_light(file, fput_needed);
 	return ret;
 }
-- 
1.6.3
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