From b28d7b2dc27f0eef1ae608b49d6860f2463910f1 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Wed, 28 Mar 2018 14:48:15 +0300 Subject: [PATCH] tracing: Uninitialized variable in create_tracing_map_fields() Smatch complains that idx can be used uninitialized when we check if (idx < 0). It has to be the first iteration through the loop and the HIST_FIELD_FL_STACKTRACE bit has to be clear and the HIST_FIELD_FL_VAR bit has to be set to reach the bug. Link: http://lkml.kernel.org/r/20180328114815.GC29050@mwanda Fixes: 30350d65ac56 ("tracing: Add variable support to hist triggers") Acked-by: Tom Zanussi Signed-off-by: Dan Carpenter Signed-off-by: Steven Rostedt (VMware) --- kernel/trace/trace_events_hist.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index 15ea11c29a51..0d7b3ffbecc2 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -4458,7 +4458,7 @@ static int create_tracing_map_fields(struct hist_trigger_data *hist_data) struct tracing_map *map = hist_data->map; struct ftrace_event_field *field; struct hist_field *hist_field; - int i, idx; + int i, idx = 0; for_each_hist_field(i, hist_data) { hist_field = hist_data->fields[i];