[PATCH v6 14/22] tracing: Add NULL trace-array check in print_synth_event()
From: Masami Hiramatsu <mhiramat@kernel.org>
Date: 2020-01-10 16:06:16
Also in:
linux-fsdevel, lkml
Subsystem:
the rest, tracing · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu
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@kernel.org> --- 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 dae2c25b209a..137fc50f2b35 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c@@ -833,7 +833,7 @@ 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);