linux-kernel - [PATCH v2 03/12] perf maps: Fix reference count leak in maps__find

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Message-ID: <20260122165407.561888-4-irogers@google.com>
Date: Thu, 22 Jan 2026 08:53:58 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	James Clark <james.clark@...aro.org>, John Garry <john.g.garry@...cle.com>, 
	Will Deacon <will@...nel.org>, Leo Yan <leo.yan@...ux.dev>, Guo Ren <guoren@...nel.org>, 
	Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Alexandre Ghiti <alex@...ti.fr>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>, Bill Wendling <morbo@...gle.com>, 
	Justin Stitt <justinstitt@...gle.com>, Zecheng Li <zecheng@...gle.com>, 
	Tianyou Li <tianyou.li@...el.com>, Thomas Falcon <thomas.falcon@...el.com>, 
	Julia Lawall <Julia.Lawall@...ia.fr>, Suchit Karunakaran <suchitkarunakaran@...il.com>, 
	Athira Rajeev <atrajeev@...ux.ibm.com>, Aditya Bodkhe <aditya.b1@...ux.ibm.com>, 
	Howard Chu <howardchu95@...il.com>, 
	"Krzysztof Łopatowski" <krzysztof.m.lopatowski@...il.com>, 
	"Dr. David Alan Gilbert" <linux@...blig.org>, Shimin Guo <shimin.guo@...dio.com>, 
	Sergei Trofimovich <slyich@...il.com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-csky@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: [PATCH v2 03/12] perf maps: Fix reference count leak in maps__find_ams

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.

Signed-off-by: Ian Rogers <irogers@...gle.com>
Fixes: 42fd623b58db ("perf maps: Get map before returning in maps__find")
---
 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 8ccc46d515b6..4092211cff62 100644
--- a/tools/perf/util/maps.c
+++ b/tools/perf/util/maps.c
@@ -708,6 +708,7 @@ 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;
-- 
2.52.0.457.g6b5491de43-goog