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

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Message-Id: <2643328537a8f753c1018b1f4d1128e87ed8f043.1581630377.git.zanussi@kernel.org>
Date:   Thu, 13 Feb 2020 16:16:45 -0600
From:   Tom Zanussi <zanussi@...nel.org>
To:     rostedt@...dmis.org
Cc:     artem.bityutskiy@...ux.intel.com, mhiramat@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] tracing: Check that number of vals matches number of synth  event fields

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@...nel.org>
---
 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