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

Greg Kroah-Hartman
2018-08-23T08:49:45Z

From: Ravi Bangoria <ravi.bangoria@linux.ibm.com>

[ 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@linux.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: David Carrillo-Cisneros <davidcc@google.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Fixes: a14390fde64e ("perf script: Allow creating per-event dump files")
Link: http://lkml.kernel.org/r/20180625124220.6434-3-ravi.bangoria@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
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;