[PATCH] tracing/filters: Defer pred allocation, fix memory leak

[Li Zefan]

Check if we have already allocated memory for filter preds.

Spotted-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
---
 kernel/trace/trace_events_filter.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index c6b2edf..93660fb 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -409,6 +409,9 @@ static int init_preds(struct ftrace_event_call *call)
 	struct filter_pred *pred;
 	int i;
 
+	if (call->filter)
+		return 0;
+
 	filter = call->filter = kzalloc(sizeof(*filter), GFP_KERNEL);
 	if (!call->filter)
 		return -ENOMEM;
@@ -447,11 +450,9 @@ static int init_subsystem_preds(struct event_subsystem *system)
 		if (strcmp(call->system, system->name) != 0)
 			continue;
 
-		if (!call->filter) {
-			err = init_preds(call);
-			if (err)
-				return err;
-		}
+		err = init_preds(call);
+		if (err)
+			return err;
 	}
 
 	return 0;
-- 
1.6.3

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