3.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Namhyung Kim <[email protected]>

commit ed6f1c996bfe4b6e520cf7a74b51cd6988d84420 upstream.

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

Link: 
http://lkml.kernel.org/r/[email protected]

Signed-off-by: Namhyung Kim <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Namhyung Kim <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

---
 kernel/trace/trace.c       |    2 ++
 kernel/trace/trace_stack.c |    2 ++
 kernel/trace/trace_stat.c  |    2 ++
 3 files changed, 6 insertions(+)

--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5028,6 +5028,8 @@ static __init int tracer_init_debugfs(vo
        trace_access_lock_init();
 
        d_tracer = tracing_init_dentry();
+       if (!d_tracer)
+               return 0;
 
        trace_create_file("trace_options", 0644, d_tracer,
                        NULL, &tracing_iter_fops);
--- 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);
--- 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)


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