perf tools: Pre-check sample size before parsing
Check that the total size of the sample fields having a fixed
size do not exceed the one of the whole event. This robustifies
the sample parsing.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
diff --git a/tools/perf/builtin-test.c b/tools/perf/builtin-test.c
index 11e3c84..44d7df2 100644
--- a/tools/perf/builtin-test.c
+++ b/tools/perf/builtin-test.c
@@ -474,6 +474,7 @@
unsigned int nr_events[nsyscalls],
expected_nr_events[nsyscalls], i, j;
struct perf_evsel *evsels[nsyscalls], *evsel;
+ int sample_size = perf_sample_size(attr.sample_type);
for (i = 0; i < nsyscalls; ++i) {
char name[64];
@@ -558,7 +559,8 @@
goto out_munmap;
}
- perf_event__parse_sample(event, attr.sample_type, false, &sample);
+ perf_event__parse_sample(event, attr.sample_type, sample_size,
+ false, &sample);
evsel = perf_evlist__id2evsel(evlist, sample.id);
if (evsel == NULL) {
pr_debug("event with id %" PRIu64