perf dso: Fix memory leak in dso__new_map()

BugLink: https://bugs.launchpad.net/bugs/1939899
[ Upstream commit 581e295a0f6b5c2931d280259fbbfff56959faa9 ]

ASan reports a memory leak when running:

  # 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>
Fixes: d3a7c489c7fd2463 ("perf tools: Reference count struct dso")
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/60bfe0cd06e89e2ca33646eb8468d7f5de2ee597.1626343282.git.rickyman7@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index ab2e130dc07a645c4083c3b2ad404d96fc6a0086..7f07a5dc555f8b23dc4ddf49b66bdafbe0495af2 100644 (file)
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -1086,8 +1086,10 @@ 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;
 }