linux-kernel - [PATCH 1/2] tracing/filters: add missing unlock in a failure path

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Date:	Fri, 15 May 2009 11:07:27 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tom Zanussi <tzanussi@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] tracing/filters: add missing unlock in a failure path


[ Impact: fix deadlock in a rare case we fail to allocate memory ]

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
---
 kernel/trace/trace_events_filter.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 85ad6a8..22c2998 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -1079,9 +1079,10 @@ int apply_event_filter(struct ftrace_event_call *call, char *filter_string)
 		return 0;
 	}
 
+	err = -ENOMEM;
 	ps = kzalloc(sizeof(*ps), GFP_KERNEL);
 	if (!ps)
-		return -ENOMEM;
+		goto out_unlock;
 
 	filter_disable_preds(call);
 	replace_filter_string(call->filter, filter_string);
@@ -1101,7 +1102,7 @@ out:
 	filter_opstack_clear(ps);
 	postfix_clear(ps);
 	kfree(ps);
-
+out_unlock:
 	mutex_unlock(&filter_mutex);
 
 	return err;
@@ -1123,9 +1124,10 @@ int apply_subsystem_event_filter(struct event_subsystem *system,
 		return 0;
 	}
 
+	err = -ENOMEM;
 	ps = kzalloc(sizeof(*ps), GFP_KERNEL);
 	if (!ps)
-		return -ENOMEM;
+		goto out_unlock;
 
 	filter_free_subsystem_preds(system);
 	replace_filter_string(system->filter, filter_string);
@@ -1145,7 +1147,7 @@ out:
 	filter_opstack_clear(ps);
 	postfix_clear(ps);
 	kfree(ps);
-
+out_unlock:
 	mutex_unlock(&filter_mutex);
 
 	return err;
-- 
1.5.4.rc3


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