If parse_events__scanner() collects no entry, perf_evlist__last(evlist) is invalid. Then setting of cmdline_group_boundary touches invalid.
It could happend in currect BPF implementation. See [1]. Although it can be fixed, for safety reason it whould be better to introduce this check. [1]: http://lkml.kernel.org/n/[email protected] Signed-off-by: Wang Nan <[email protected]> Cc: Alexei Starovoitov <[email protected]> Cc: Masami Hiramatsu <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Zefan Li <[email protected]> Cc: [email protected] Cc: Arnaldo Carvalho de Melo <[email protected]> --- tools/perf/util/parse-events.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index cce3e43..02609da 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -1171,9 +1171,11 @@ int parse_events(struct perf_evlist *evlist, const char *str, perf_evlist__splice_list_tail(evlist, &data.list, entries); evlist->nr_groups += data.nr_groups; - last = perf_evlist__last(evlist); - last->cmdline_group_boundary = true; + if (entries > 0) { + last = perf_evlist__last(evlist); + last->cmdline_group_boundary = true; + } return 0; } -- 1.8.3.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
