tracing: Check return value of tracing_init_dentry()

commit ed6f1c996bfe4b6e520cf7a74b51cd6988d84420 upstream.

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

Link: http://lkml.kernel.org/r/1365553093-10180-2-git-send-email-namhyung@kernel.org
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8aa3ca73cfdab5c2a87d06472f2cb6c4cf9d9475..0ec6c349bbc9c2a8a840cf850d0348fb1fa560a5 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4563,6 +4563,8 @@ static __init int tracer_init_debugfs(void)
        trace_access_lock_init();
 
        d_tracer = tracing_init_dentry();
+       if (!d_tracer)
+               return 0;
 
        trace_create_file("tracing_enabled", 0644, d_tracer,
                        &global_trace, &tracing_ctrl_fops);

diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index ca811a4af980adf1b7c02552710bdc7f2deffd49..c5b20a3564a817d09650e0587cdab997895262ae 100644 (file)
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -411,6 +411,8 @@ 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 96cffb269e7360e131e445c8c0013c90419f0921..847f88a6194b4e4183e0ed08dd03828f6e5ff1bd 100644 (file)
--- 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)