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tracing: Add NULL trace-array check in print_synth_event() 

Add NULL trace-array check in print_synth_event(), because
if we enable tp_printk option, iter->tr can be NULL.

Link: http://lkml.kernel.org/r/157867236536.17873.12529350542460184019.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2020-01-11 01:06:05 +09:00 committed by Steven Rostedt (VMware)
parent b05e89ae7c
commit 48ac9488a5
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace_events_hist.c
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@ -833,7 +833,7 @@ static enum print_line_t print_synth_event(struct trace_iterator *iter,
fmt = synth_field_fmt(se->fields[i]->type); fmt = synth_field_fmt(se->fields[i]->type);
/* parameter types */ /* parameter types */
if (tr->trace_flags & TRACE_ITER_VERBOSE) if (tr && tr->trace_flags & TRACE_ITER_VERBOSE)
trace_seq_printf(s, "%s ", fmt); trace_seq_printf(s, "%s ", fmt);
snprintf(print_fmt, sizeof(print_fmt), "%%s=%s%%s", fmt); snprintf(print_fmt, sizeof(print_fmt), "%%s=%s%%s", fmt);