[PATCH v2 2/3] perf script: Fix crash because of missing evsel->priv

[Ravi Bangoria]

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

Before:
  # ./perf record -o - -- ls | ./perf script
    Segmentation fault (core dumped)

After:
  # ./perf record -o - -- ls | ./perf script
  ls 2282 1031.731974:  250000 cpu-clock:uhH:  7effe4b3d29e
  ls 2282 1031.732222:  250000 cpu-clock:uhH:  7effe4b3a650

Signed-off-by: Ravi Bangoria <ravi.bango...@linux.ibm.com>
Fixes: a14390fde64e ("perf script: Allow creating per-event dump files")
---
 tools/perf/builtin-script.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index f3fefbcc4503..ad2ac1300420 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1834,6 +1834,7 @@ static int process_attr(struct perf_tool *tool, union 
perf_event *event,
        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)
@@ -1842,6 +1843,19 @@ static int process_attr(struct perf_tool *tool, union 
perf_event *event,
        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;
-- 
2.14.4