[PATCH 3/3] tracing: Check that number of vals matches number of synth event fields

[Tom Zanussi]

Commit 7276531d4036('tracing: Consolidate trace() functions')
inadvertently dropped the synth_event_trace() and
synth_event_trace_array() checks that verify the number of values
passed in matches the number of fields in the synthetic event being
traced, so add them back.

Signed-off-by: Tom Zanussi <zanussi@xxxxxxxxxx>
---
 kernel/trace/trace_events_hist.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 913760d2d505..d931f1404505 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1885,6 +1885,9 @@ int synth_event_trace(struct trace_event_file *file, unsigned int n_vals, ...)
 		return ret;
 	}
 
+	if (n_vals != state.event->n_fields)
+		return -EINVAL;
+
 	va_start(args, n_vals);
 	for (i = 0, n_u64 = 0; i < state.event->n_fields; i++) {
 		u64 val;
@@ -1960,6 +1963,9 @@ int synth_event_trace_array(struct trace_event_file *file, u64 *vals,
 		return ret;
 	}
 
+	if (n_vals != state.event->n_fields)
+		return -EINVAL;
+
 	for (i = 0, n_u64 = 0; i < state.event->n_fields; i++) {
 		if (state.event->fields[i]->is_string) {
 			char *str_val = (char *)(long)vals[i];
-- 
2.14.1