[PATCH 06/20] perf dso: fix memory leak in dso__new_map

From: Riccardo Mancini <rickyman7@gmail.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ian Rogers <irogers@google.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Mark Rutland <mark.rutland@arm.com>, Jiri Olsa <jolsa@redhat.com>,
	linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
	Riccardo Mancini <rickyman7@gmail.com>
Subject: [PATCH 06/20] perf dso: fix memory leak in dso__new_map
Date: Thu, 15 Jul 2021 18:07:11 +0200	[thread overview]
Message-ID: <60bfe0cd06e89e2ca33646eb8468d7f5de2ee597.1626343282.git.rickyman7@gmail.com> (raw)
In-Reply-To: <cover.1626343282.git.rickyman7@gmail.com>

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@gmail.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

