linux-kernel - [PATCH 5.12 388/700] RDMA/rtrs-clt: Fix memory leak of not-freed sess->stats and stats->pcpu

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Date:   Mon, 12 Jul 2021 08:07:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Gioh Kim <gi-oh.kim@...os.com>,
        Jack Wang <jinpu.wang@...os.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 388/700] RDMA/rtrs-clt: Fix memory leak of not-freed sess->stats and stats->pcpu_stats

From: Gioh Kim <gi-oh.kim@...ud.ionos.com>

[ Upstream commit 7ecd7e290bee0ab9cf75b79a367a4cc113cf8292 ]

sess->stats and sess->stats->pcpu_stats objects are freed
when sysfs entry is removed. If something wrong happens and
session is closed before sysfs entry is created,
sess->stats and sess->stats->pcpu_stats objects are not freed.

This patch adds freeing of them at three places:
1. When client uses wrong address and session creation fails.
2. When client fails to create a sysfs entry.
3. When client adds wrong address via sysfs add_path.

Fixes: 215378b838df0 ("RDMA/rtrs: client: sysfs interface functions")
Link: https://lore.kernel.org/r/20210528113018.52290-21-jinpu.wang@ionos.com
Signed-off-by: Gioh Kim <gi-oh.kim@...os.com>
Signed-off-by: Jack Wang <jinpu.wang@...os.com>
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/infiniband/ulp/rtrs/rtrs-clt.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
index 1c581c4faacd..49d12dd4a503 100644
--- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c
+++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
@@ -2689,6 +2689,8 @@ struct rtrs_clt *rtrs_clt_open(struct rtrs_clt_ops *ops,
 		if (err) {
 			list_del_rcu(&sess->s.entry);
 			rtrs_clt_close_conns(sess, true);
+			free_percpu(sess->stats->pcpu_stats);
+			kfree(sess->stats);
 			free_sess(sess);
 			goto close_all_sess;
 		}
@@ -2697,6 +2699,8 @@ struct rtrs_clt *rtrs_clt_open(struct rtrs_clt_ops *ops,
 		if (err) {
 			list_del_rcu(&sess->s.entry);
 			rtrs_clt_close_conns(sess, true);
+			free_percpu(sess->stats->pcpu_stats);
+			kfree(sess->stats);
 			free_sess(sess);
 			goto close_all_sess;
 		}
@@ -2954,6 +2958,8 @@ int rtrs_clt_create_path_from_sysfs(struct rtrs_clt *clt,
 close_sess:
 	rtrs_clt_remove_path_from_arr(sess);
 	rtrs_clt_close_conns(sess, true);
+	free_percpu(sess->stats->pcpu_stats);
+	kfree(sess->stats);
 	free_sess(sess);
 
 	return err;
-- 
2.30.2