linux-kernel - [2.6.31 PATCH] tracing/filters: always free pred on filter_add_subsystem

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Date:	Sat, 08 Aug 2009 10:49:53 -0500
From:	Tom Zanussi <tzanussi@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Li Zefan <lizf@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [2.6.31 PATCH] tracing/filters: always free pred on
 filter_add_subsystem_pred() failure

If filter_add_subsystem_pred() fails due to ENOSPC or ENOMEM, the pred
doesn't get freed, while as a side effect it does for other errors.
Make it so the caller always frees the pred for any error.

Signed-off-by: Tom Zanussi <tzanussi@...il.com>
---
 kernel/trace/trace_events_filter.c |   16 +++++++++++-----
 1 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 1557148..f32dc9d 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -624,9 +624,6 @@ static int filter_add_subsystem_pred(struct filter_parse_state *ps,
 		return -ENOSPC;
 	}
 
-	filter->preds[filter->n_preds] = pred;
-	filter->n_preds++;
-
 	list_for_each_entry(call, &ftrace_events, list) {
 
 		if (!call->define_fields)
@@ -643,6 +640,9 @@ static int filter_add_subsystem_pred(struct filter_parse_state *ps,
 		}
 		replace_filter_string(call->filter, filter_string);
 	}
+
+	filter->preds[filter->n_preds] = pred;
+	filter->n_preds++;
 out:
 	return err;
 }
@@ -1034,9 +1034,12 @@ static int replace_preds(struct event_subsystem *system,
 			if (call) {
 				err = filter_add_pred(ps, call, pred);
 				filter_free_pred(pred);
-			} else
+			} else {
 				err = filter_add_subsystem_pred(ps, system,
 							pred, filter_string);
+				if (err)
+					filter_free_pred(pred);
+			}
 			if (err)
 				return err;
 
@@ -1055,9 +1058,12 @@ static int replace_preds(struct event_subsystem *system,
 		if (call) {
 			err = filter_add_pred(ps, call, pred);
 			filter_free_pred(pred);
-		} else
+		} else {
 			err = filter_add_subsystem_pred(ps, system, pred,
 							filter_string);
+			if (err)
+				filter_free_pred(pred);
+		}
 		if (err)
 			return err;
 
-- 
1.5.6.3



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