[048/105] perf: Fix task_struct reference leak

Greg KH
2011-04-12T14:51:34Z

From: Peter Zijlstra <a.p.zijlstra@chello.nl>

commit fd1edb3aa2c1d92618d8f0c6d15d44ea41fcac6a upstream.

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

Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
kernel/perf_event.c | 5 +++++
1 file changed, 5 insertions(+)

--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -5917,6 +5917,11 @@ 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):
*/