Add NULL trace-array check in print_synth_event(), because if we enable tp_printk option, iter->tr can be NULL. Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx> --- 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 a7f447195143..db973928e580 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -822,7 +822,7 @@ static enum print_line_t print_synth_event(struct trace_iterator *iter, fmt = synth_field_fmt(se->fields[i]->type); /* parameter types */ - if (tr->trace_flags & TRACE_ITER_VERBOSE) + if (tr && tr->trace_flags & TRACE_ITER_VERBOSE) trace_seq_printf(s, "%s ", fmt); snprintf(print_fmt, sizeof(print_fmt), "%%s=%s%%s", fmt);
