tracing: Add missing nest end to synth_event_trace_start() error case

If the ring_buffer reserve in synth_event_trace_start() fails, the
matching ring_buffer_nest_end() should be called in the error code,
since nothing else will ever call it in this case.

Link: http://lkml.kernel.org/r/20abc444b3eeff76425f895815380abe7aa53ff8.1581374549.git.zanussi@kernel.org
Fixes: 8dcc53ad956d2 ("tracing: Add synth_event_trace() and related functions")
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index b3bcfd8..a546ffa 100644 (file)
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -2043,6 +2043,7 @@ int synth_event_trace_start(struct trace_event_file *file,
        entry = trace_event_buffer_reserve(&trace_state->fbuffer, file,
                                           sizeof(*entry) + fields_size);
        if (!entry) {
+               ring_buffer_nest_end(trace_state->buffer);
                ret = -EINVAL;
                goto out;
        }