[tip:perf/core] perf cgroup: Fix leak of file reference count

[tip-bot for Li Zefan <lizf@cn.fujitsu.com>]

Commit-ID:  3db272c0494900fcb905a201180a78cae3addd6e
Gitweb:     http://git.kernel.org/tip/3db272c0494900fcb905a201180a78cae3addd6e
Author:     Li Zefan <lizf@cn.fujitsu.com>
AuthorDate: Thu, 3 Mar 2011 14:25:37 +0800
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Fri, 4 Mar 2011 11:32:50 +0100

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@cn.fujitsu.com>
Acked-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <4D6F3461.6060406@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 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 821ce82..7c999e8 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;
 }