linux-kernel - [PATCH] perf, script: Fix crash with printing mixed trace point and other events

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Message-Id: <20190117194834.21940-1-andi@firstfloor.org>
Date:   Thu, 17 Jan 2019 11:48:34 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     acme@...nel.org
Cc:     jolsa@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH] perf, script: Fix crash with printing mixed trace point and other events

From: Andi Kleen <ak@...ux.intel.com>

perf script crashes currently when printing mixed trace points and other
events because the trace format does not handle events without trace
meta data. Add a simple check to avoid that.

% cat > test.c
main()
{
    printf("Hello world\n");
}
^D
% gcc -g -o test test.c
% sudo perf probe -x test 'test.c:3'
% perf record -e '{cpu/cpu-cycles,period=10000/,probe_test:main}:S' ./test
% perf script
<segfault>

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 tools/perf/builtin-script.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 3728b50e52e2..ea2396b33a57 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1779,7 +1779,7 @@ static void process_event(struct perf_script *script,
 		return;
 	}
 
-	if (PRINT_FIELD(TRACE)) {
+	if (PRINT_FIELD(TRACE) && sample->raw_data) {
 		event_format__fprintf(evsel->tp_format, sample->cpu,
 				      sample->raw_data, sample->raw_size, fp);
 	}
-- 
2.17.2