tracing: Missing error code in tracer_alloc_buffers()

If ring_buffer_alloc() or one of the next couple function calls fail
then we should return -ENOMEM but the current code returns success.

Link: http://lkml.kernel.org/r/20170801110201.ajdkct7vwzixahvx@mwanda
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: stable@vger.kernel.org
Fixes: b32614c03413 ('tracing/rb: Convert to hotplug state machine')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 784fb43b2abeedf150e17fda4d7e43cf078c578b..d815fc317e9d77aa3ff36a323f4752878cfbae44 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -8293,6 +8293,7 @@ __init static int tracer_alloc_buffers(void)
        if (ret < 0)
                goto out_free_cpumask;
        /* Used for event triggers */
+       ret = -ENOMEM;
        temp_buffer = ring_buffer_alloc(PAGE_SIZE, RB_FL_OVERWRITE);
        if (!temp_buffer)
                goto out_rm_hp_state;