linux-kernel - [PATCH 6.8 485/715] perf pmu: Fix a potential memory leak in perf_pmu_

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Date: Sun, 24 Mar 2024 18:31:04 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Ian Rogers <irogers@...gle.com>,
	kernel-janitors@...r.kernel.org,
	Namhyung Kim <namhyung@...nel.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.8 485/715] perf pmu: Fix a potential memory leak in perf_pmu__lookup()

From: Christophe JAILLET <christophe.jaillet@...adoo.fr>

[ Upstream commit ef5de1613d7d92bdc975e6beb34bb0fa94f34078 ]

The commit in Fixes has reordered some code, but missed an error handling
path.

'goto err' now, in order to avoid a memory leak in case of error.

Fixes: f63a536f03a2 ("perf pmu: Merge JSON events with sysfs at load time")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Reviewed-by: Ian Rogers <irogers@...gle.com>
Cc: kernel-janitors@...r.kernel.org
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Link: https://lore.kernel.org/r/9538b2b634894c33168dfe9d848d4df31fd4d801.1693085544.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/perf/util/pmu.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 88b9aa7d3a27a..6b82f4759ce69 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -1019,10 +1019,9 @@ struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char
 	 * type value and format definitions. Load both right
 	 * now.
 	 */
-	if (pmu_format(pmu, dirfd, name)) {
-		free(pmu);
-		return NULL;
-	}
+	if (pmu_format(pmu, dirfd, name))
+		goto err;
+
 	pmu->is_core = is_pmu_core(name);
 	pmu->cpus = pmu_cpumask(dirfd, name, pmu->is_core);
 
-- 
2.43.0