linux-kernel - [PATCH 06/10] libperf: Do not allow PERF_FORMAT_GROUP in perf_evsel_

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Date:   Tue, 22 Jun 2021 17:39:14 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH 06/10] libperf: Do not allow PERF_FORMAT_GROUP in perf_evsel__read

The struct perf_counts_values can hold only first three
read_format bits. We can't allow PERF_FORMAT_GROUP,
otherwise we get segfault.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/lib/perf/evsel.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/lib/perf/evsel.c b/tools/lib/perf/evsel.c
index bd8c2f19ef74..04e8386b3ed4 100644
--- a/tools/lib/perf/evsel.c
+++ b/tools/lib/perf/evsel.c
@@ -260,8 +260,12 @@ int perf_evsel__read_size(struct perf_evsel *evsel)
 int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
 		     struct perf_counts_values *count)
 {
+	u64 read_format = evsel->attr.read_format;
 	size_t size = perf_evsel__read_size(evsel);
 
+	if (read_format & PERF_FORMAT_GROUP)
+		return -EINVAL;
+
 	memset(count, 0, sizeof(*count));
 
 	if (FD(evsel, cpu, thread) < 0)
-- 
2.31.1