From: Riccardo Mancini rickyman7@gmail.com
[ Upstream commit 2d6b74baa7147251c30a46c4996e8cc224aa2dc5 ]
ASan reports a memory leak of nsinfo during the execution of
# perf test "31: Lookup mmap thread"
The leak is caused by a refcounted variable being replaced without dropping the refcount.
This patch makes sure that the refcnt of nsinfo is decreased whenever a refcounted variable is replaced with a new value.
Signed-off-by: Riccardo Mancini rickyman7@gmail.com Fixes: bf2e710b3cb8445c ("perf maps: Lookup maps in both intitial mountns and inner mountns.") Cc: Ian Rogers irogers@google.com Cc: Jiri Olsa jolsa@redhat.com Cc: Krister Johansen kjlx@templeofstupid.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/55223bc8821b34ccb01f92ef1401c02b6a32e61f.1626343... [ Split from a larger patch ] Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/util/map.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c index 769d11575a7b..603086692290 100644 --- a/tools/perf/util/map.c +++ b/tools/perf/util/map.c @@ -209,6 +209,8 @@ struct map *map__new(struct machine *machine, u64 start, u64 len, if (!(prot & PROT_EXEC)) dso__set_loaded(dso); } + + nsinfo__put(dso->nsinfo); dso->nsinfo = nsi; dso__put(dso); }