[PATCH 6.18 012/752] perf maps: Fix reference count leak in maps__find_ams()

Sasha Levin
2026-02-28T17:48:15Z

From: Ian Rogers <irogers@google.com>

[ Upstream commit 6fdd2676db55b503c52dd3f1359b5c57f774ab75 ]

ams and so ams->ms.map is an in argument, however, it is also
overwritten. As a map is reference counted, ensure a map__put() is done
before overwriting it.

Fixes: 42fd623b58dbcc48 ("perf maps: Get map before returning in maps__find")
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Aditya Bodkhe <aditya.b1@linux.ibm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Athira Rajeev <atrajeev@linux.ibm.com>
Cc: Bill Wendling <morbo@google.com>
Cc: Dr. David Alan Gilbert <linux@treblig.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Julia Lawall <Julia.Lawall@inria.fr>
Cc: Justin Stitt <justinstitt@google.com>
Cc: Krzysztof Łopatowski <krzysztof.m.lopatowski@gmail.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <nick.desaulniers+lkml@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <pjw@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sergei Trofimovich <slyich@gmail.com>
Cc: Shimin Guo <shimin.guo@skydio.com>
Cc: Suchit Karunakaran <suchitkarunakaran@gmail.com>
Cc: Thomas Falcon <thomas.falcon@intel.com>
Cc: Tianyou Li <tianyou.li@intel.com>
Cc: Will Deacon <will@kernel.org>
Cc: Zecheng Li <zecheng@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/perf/util/maps.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/maps.c b/tools/perf/util/maps.c
index 779f6230130af..c51ec159ac769 100644
--- a/tools/perf/util/maps.c
+++ b/tools/perf/util/maps.c
@@ -676,6 +676,7 @@ int maps__find_ams(struct maps *maps, struct addr_map_symbol *ams)
if (ams->addr < map__start(ams->ms.map) || ams->addr >= map__end(ams->ms.map)) {
if (maps == NULL)
return -1;
+ map__put(ams->ms.map);
ams->ms.map = maps__find(maps, ams->addr);
if (ams->ms.map == NULL)
return -1;
--
2.51.0