linux-kernel - [PATCH 2/3] tracing: Check return value of tracing_init

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Date:	Wed, 10 Apr 2013 09:18:12 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>
Subject: [PATCH 2/3] tracing: Check return value of tracing_init_dentry()

From: Namhyung Kim <namhyung.kim@....com>

Check return value and bail out if it's NULL.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 kernel/trace/trace.c       | 2 ++
 kernel/trace/trace_stack.c | 2 ++
 kernel/trace/trace_stat.c  | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 829b2bee24e8..7270460cfe3c 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5953,6 +5953,8 @@ static __init int tracer_init_debugfs(void)
 	trace_access_lock_init();
 
 	d_tracer = tracing_init_dentry();
+	if (!d_tracer)
+		return 0;
 
 	init_tracer_debugfs(&global_trace, d_tracer);
 
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index aab277b67fa9..8c3f37e2dc43 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -431,6 +431,8 @@ static __init int stack_trace_init(void)
 	struct dentry *d_tracer;
 
 	d_tracer = tracing_init_dentry();
+	if (!d_tracer)
+		return 0;
 
 	trace_create_file("stack_max_size", 0644, d_tracer,
 			&max_stack_size, &stack_max_size_fops);
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index 96cffb269e73..847f88a6194b 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -307,6 +307,8 @@ static int tracing_stat_init(void)
 	struct dentry *d_tracing;
 
 	d_tracing = tracing_init_dentry();
+	if (!d_tracing)
+		return 0;
 
 	stat_dir = debugfs_create_dir("trace_stat", d_tracing);
 	if (!stat_dir)
-- 
1.7.11.7

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