From: Ian Rogers irogers@google.com
[ Upstream commit 8e8714c3d157568b7a769917a5e05573bbaf5af0 ]
If event parsing fails the event list is leaked, instead splice the list onto the out result and let the caller cleanup.
An example input for parse_events found by libFuzzer that reproduces this memory leak is 'm{'.
Signed-off-by: Ian Rogers irogers@google.com Acked-by: Jiri Olsa jolsa@kernel.org Cc: Adrian Hunter adrian.hunter@intel.com Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Alexei Starovoitov ast@kernel.org Cc: Andi Kleen ak@linux.intel.com Cc: Daniel Borkmann daniel@iogearbox.net Cc: Jin Yao yao.jin@linux.intel.com Cc: John Garry john.garry@huawei.com Cc: Kan Liang kan.liang@linux.intel.com Cc: Mark Rutland mark.rutland@arm.com Cc: Martin KaFai Lau kafai@fb.com Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra peterz@infradead.org Cc: Song Liu songliubraving@fb.com Cc: Stephane Eranian eranian@google.com Cc: Yonghong Song yhs@fb.com Cc: bpf@vger.kernel.org Cc: clang-built-linux@googlegroups.com Cc: netdev@vger.kernel.org Link: http://lore.kernel.org/lkml/20191025180827.191916-5-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/util/parse-events.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 1a7c76d2baa8..7ea1a230e89d 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -1843,15 +1843,20 @@ int parse_events(struct perf_evlist *evlist, const char *str,
ret = parse_events__scanner(str, &parse_state, PE_START_EVENTS); perf_pmu__parse_cleanup(); + + if (!ret && list_empty(&parse_state.list)) { + WARN_ONCE(true, "WARNING: event parser found nothing\n"); + return -1; + } + + /* + * Add list to the evlist even with errors to allow callers to clean up. + */ + perf_evlist__splice_list_tail(evlist, &parse_state.list); + if (!ret) { struct perf_evsel *last;
- if (list_empty(&parse_state.list)) { - WARN_ONCE(true, "WARNING: event parser found nothing\n"); - return -1; - } - - perf_evlist__splice_list_tail(evlist, &parse_state.list); evlist->nr_groups += parse_state.nr_groups; last = perf_evlist__last(evlist); last->cmdline_group_boundary = true;