[PATCH 4.17 119/324] perf script: Fix crash because of missing evsel->priv

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxx>

[ Upstream commit a3af66f51bd0bca72881ead4bf2bd19cb366582b ]

'perf script' in piped mode is crashing because evsel->priv is not set
properly. Fix it.

Before:

  # perf record -o - -- ls | perf script
  <SNIP 'ls' output>
    Segmentation fault (core dumped)
  #

After:

  # perf record -o - -- ls | perf script
  <SNIP 'ls' output>
  ls 2282 1031.731974:  250000 cpu-clock:uhH:  7effe4b3d29e
  ls 2282 1031.732222:  250000 cpu-clock:uhH:  7effe4b3a650
  #

Signed-off-by: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxx>
Tested-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: David Carrillo-Cisneros <davidcc@xxxxxxxxxx>
Cc: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Fixes: a14390fde64e ("perf script: Allow creating per-event dump files")
Link: http://lkml.kernel.org/r/20180625124220.6434-3-ravi.bangoria@xxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 tools/perf/builtin-script.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1832,6 +1832,7 @@ static int process_attr(struct perf_tool
 	struct perf_evlist *evlist;
 	struct perf_evsel *evsel, *pos;
 	int err;
+	static struct perf_evsel_script *es;
 
 	err = perf_event__process_attr(tool, event, pevlist);
 	if (err)
@@ -1840,6 +1841,19 @@ static int process_attr(struct perf_tool
 	evlist = *pevlist;
 	evsel = perf_evlist__last(*pevlist);
 
+	if (!evsel->priv) {
+		if (scr->per_event_dump) {
+			evsel->priv = perf_evsel_script__new(evsel,
+						scr->session->data);
+		} else {
+			es = zalloc(sizeof(*es));
+			if (!es)
+				return -ENOMEM;
+			es->fp = stdout;
+			evsel->priv = es;
+		}
+	}
+
 	if (evsel->attr.type >= PERF_TYPE_MAX &&
 	    evsel->attr.type != PERF_TYPE_SYNTH)
 		return 0;