linux-kernel - [PATCH v7 10/13] perf tools: fix NULL point in evsel_

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Date:   Tue, 22 Mar 2022 15:15:14 -0700
From:   Stephane Eranian <eranian@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     peterz@...radead.org, kim.phillips@....com, acme@...hat.com,
        jolsa@...hat.com, songliubraving@...com, rafael@...nel.org,
        ravi.bangoria@....com, sandipan.das@....com
Subject: [PATCH v7 10/13] perf tools: fix NULL point in evsel__env()

evsel_env() cannot return NULL. In case evsel->evlist->env is NULL default
to perf_env. Fixes crashes in evsel__open_strerror()

Signed-off-by: Ravi Bangoria <ravi.bangoria@....com>
Reviewed-by: Stephane Eranian <eranian@...gle.com>
---
 tools/perf/util/evsel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 22d3267ce294..14b0e7ffa2c7 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2965,7 +2965,7 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target,
 
 struct perf_env *evsel__env(struct evsel *evsel)
 {
-	if (evsel && evsel->evlist)
+	if (evsel && evsel->evlist && evsel->evlist->env)
 		return evsel->evlist->env;
 	return &perf_env;
 }
-- 
2.35.1.894.gb6a874cedc-goog