[tip:perf/urgent] perf: Fix task_struct reference leak

[tip-bot for Peter Zijlstra]

Commit-ID:  fd1edb3aa2c1d92618d8f0c6d15d44ea41fcac6a
Gitweb:     http://git.kernel.org/tip/fd1edb3aa2c1d92618d8f0c6d15d44ea41fcac6a
Author:     Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
AuthorDate: Mon, 28 Mar 2011 13:13:56 +0200
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Thu, 31 Mar 2011 13:02:56 +0200

perf: Fix task_struct reference leak

sys_perf_event_open() had an imbalance in the number of task refs it
took causing memory leakage

Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: stable@xxxxxxxxxx # .37+
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
 kernel/perf_event.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 2616909..27960f1 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -6531,6 +6531,11 @@ SYSCALL_DEFINE5(perf_event_open,
 		goto err_alloc;
 	}
 
+	if (task) {
+		put_task_struct(task);
+		task = NULL;
+	}
+
 	/*
 	 * Look up the group leader (we will attach this event to it):
 	 */
--
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