From d0b849e9bced36cf279881294c07c43b0b9dce86 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Mon, 11 Nov 2013 16:28:42 -0300 Subject: [PATCH] perf tests: Check return of perf_evlist__open sw clock event period test We were not checking if we successfully opened the counters, i.e. if sys_perf_event_open worked, when it doesn't in this test, we were continuing anyway and then segfaulting when trying to access the file descriptor array, that at that point had been freed in perf_evlist__open error path: [root@ssdandy ~]# perf test -v 19 19: Test software clock events have valid period values : --- start --- Segmentation fault (core dumped) [root@ssdandy ~]# Do the check and bail out instead. Cc: Adrian Hunter Cc: David Ahern Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Mike Galbraith Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/n/tip-6qy8ljkn0e9hm7bh7keo5z68@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/tests/sw-clock.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/tools/perf/tests/sw-clock.c b/tools/perf/tests/sw-clock.c index 73c5c37cb27b..ed777728dfe7 100644 --- a/tools/perf/tests/sw-clock.c +++ b/tools/perf/tests/sw-clock.c @@ -57,7 +57,11 @@ static int __test__sw_clock_freq(enum perf_sw_ids clock_id) goto out_delete_maps; } - perf_evlist__open(evlist); + if (perf_evlist__open(evlist)) { + err = -errno; + pr_debug("Couldn't open evlist: %s\n", strerror(errno)); + goto out_delete_maps; + } err = perf_evlist__mmap(evlist, 128, true); if (err < 0) { -- 2.34.1