linux-kernel - [PATCH v1] net/tcp: use kfree_sensitive() instend of kfree() in tcp_md5_twsk_free

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Message-Id: <20231107023444.3141-1-duminjie@vivo.com>
Date:   Tue,  7 Nov 2023 10:34:43 +0800
From:   Minjie Du <duminjie@...o.com>
To:     Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev@...r.kernel.org (open list:NETWORKING [TCP]),
        linux-kernel@...r.kernel.org (open list)
Cc:     opensource.kernel@...o.com, Minjie Du <duminjie@...o.com>
Subject: [PATCH v1] net/tcp: use kfree_sensitive() instend of kfree() in tcp_md5_twsk_free_rcu()

key might contain private information, so better use
kfree_sensitive to free it.
In tcp_md5_twsk_free_rcu() use kfree_sensitive().

Signed-off-by: Minjie Du <duminjie@...o.com>
---
 net/ipv4/tcp_minisocks.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index a9807eeb311c..a7be78096783 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -368,7 +368,7 @@ static void tcp_md5_twsk_free_rcu(struct rcu_head *head)
 	struct tcp_md5sig_key *key;
 
 	key = container_of(head, struct tcp_md5sig_key, rcu);
-	kfree(key);
+	kfree_sensitive(key);
 	static_branch_slow_dec_deferred(&tcp_md5_needed);
 	tcp_md5_release_sigpool();
 }
-- 
2.39.0