linux-kernel - [PATCH 06/20] perf dso: fix memory leak in dso__new

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Message-Id: <60bfe0cd06e89e2ca33646eb8468d7f5de2ee597.1626343282.git.rickyman7@gmail.com>
Date:   Thu, 15 Jul 2021 18:07:11 +0200
From:   Riccardo Mancini <rickyman7@...il.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Riccardo Mancini <rickyman7@...il.com>
Subject: [PATCH 06/20] perf dso: fix memory leak in dso__new_map

ASan reports a memory leak when running the perf test
"65: maps__merge_in". The causes of the leaks are two, this patch
addresses only the first one, which is related to dso__new_map.
The bug is that dso__new_map creates a new dso but never decreases
the refcount it gets from creating it.

This patch adds the missing dso__put.

Signed-off-by: Riccardo Mancini <rickyman7@...il.com>
---
 tools/perf/util/dso.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index d786cf6b0cfa65f2..ee15db2be2f43403 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -1154,8 +1154,10 @@ struct map *dso__new_map(const char *name)
 	struct map *map = NULL;
 	struct dso *dso = dso__new(name);
 
-	if (dso)
+	if (dso) {
 		map = map__new2(0, dso);
+		dso__put(dso);
+	}
 
 	return map;
 }
-- 
2.31.1