linux-kernel - [PATCH 1/2] perf header: Fix one memory leakage in perf_event__fprintf_event

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Date:   Thu, 7 Dec 2023 16:16:34 +0800
From:   Yicong Yang <yangyicong@...wei.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...nel.org>, <namhyung@...nel.org>, <irogers@...gle.com>,
        <adrian.hunter@...el.com>, <linux-perf-users@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <jonathan.cameron@...wei.com>, <hejunhao3@...wei.com>,
        <yangyicong@...ilicon.com>, <linuxarm@...wei.com>
Subject: [PATCH 1/2] perf header: Fix one memory leakage in perf_event__fprintf_event_update()

From: Yicong Yang <yangyicong@...ilicon.com>

When dump the raw trace by `perf report -D` ASan reports a memory
leakage in perf_event__fprintf_event_update(). It shows that we
allocated a temporary cpumap for dumping the CPUs but doesn't
release it and it's not used elsewhere. Fix this by free the
cpumap after the dumping.

Fixes: c853f9394b7b ("perf tools: Add perf_event__fprintf_event_update function")
Cc: Jiri Olsa <jolsa@...nel.org>
Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>
---
 tools/perf/util/header.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index e86b9439ffee..7190f39ccd13 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -4369,9 +4369,10 @@ size_t perf_event__fprintf_event_update(union perf_event *event, FILE *fp)
 		ret += fprintf(fp, "... ");
 
 		map = cpu_map__new_data(&ev->cpus.cpus);
-		if (map)
+		if (map) {
 			ret += cpu_map__fprintf(map, fp);
-		else
+			perf_cpu_map__put(map);
+		} else
 			ret += fprintf(fp, "failed to get cpus\n");
 		break;
 	default:
-- 
2.24.0