linux-kernel - [PATCH 5.10 126/238] perf record: Fix possible incorrect free in record__switch

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Date: Sun, 24 Mar 2024 19:38:34 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Yang Jihong <yangjihong1@...wei.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 126/238] perf record: Fix possible incorrect free in record__switch_output()

From: Yang Jihong <yangjihong1@...wei.com>

[ Upstream commit aff10a165201f6f60cff225083ce301ad3f5d8f1 ]

perf_data__switch() may not assign a legal value to 'new_filename'.
In this case, 'new_filename' uses the on-stack value, which may cause a
incorrect free and unexpected result.

Fixes: 03724b2e9c45 ("perf record: Allow to limit number of reported perf.data files")
Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
Acked-by: Namhyung Kim <namhyung@...nel.org>
Link: https://lore.kernel.org/r/20240119040304.3708522-2-yangjihong1@huawei.com
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/perf/builtin-record.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index e5c938d538ee5..167cd8d3b7a21 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1264,8 +1264,8 @@ static int
 record__switch_output(struct record *rec, bool at_exit)
 {
 	struct perf_data *data = &rec->data;
+	char *new_filename = NULL;
 	int fd, err;
-	char *new_filename;
 
 	/* Same Size:      "2015122520103046"*/
 	char timestamp[] = "InvalidTimestamp";
-- 
2.43.0