[tip:tracing/urgent] tracing/filters: Fix memory leak when setting a filter

[tip-bot for Li Zefan]

Commit-ID:  8ad807318fcd62aba0e18c7c7fbfcc1af3fcdbab
Gitweb:     http://git.kernel.org/tip/8ad807318fcd62aba0e18c7c7fbfcc1af3fcdbab
Author:     Li Zefan <lizf@xxxxxxxxxxxxxx>
AuthorDate: Tue, 13 Oct 2009 09:28:57 +0800
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Tue, 13 Oct 2009 08:05:17 +0200

tracing/filters: Fix memory leak when setting a filter

Every time we set a filter, we leak memory allocated by
postfix_append_operand() and postfix_append_op().

Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Tom Zanussi <tzanussi@xxxxxxxxx>
Cc: <stable@xxxxxxxxxx> # for v2.6.31.x
LKML-Reference: <4AD3D7D9.4070400@xxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
 kernel/trace/trace_events_filter.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 2324578..98a6cc5 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -933,8 +933,9 @@ static void postfix_clear(struct filter_parse_state *ps)
 
 	while (!list_empty(&ps->postfix)) {
 		elt = list_first_entry(&ps->postfix, struct postfix_elt, list);
-		kfree(elt->operand);
 		list_del(&elt->list);
+		kfree(elt->operand);
+		kfree(elt);
 	}
 }
 
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