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[72.82.21.11]) by smtp.gmail.com with ESMTPSA id v5sm2984729qkh.39.2021.09.02.20.23.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Sep 2021 20:23:37 -0700 (PDT) From: Desmond Cheong Zhi Xi To: marcel@holtmann.org, johan.hedberg@gmail.com, luiz.dentz@gmail.com, davem@davemloft.net, kuba@kernel.org Cc: Desmond Cheong Zhi Xi , linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, eric.dumazet@gmail.com Subject: [PATCH 2/2] Bluetooth: fix init and cleanup of sco_conn.timeout_work Date: Thu, 2 Sep 2021 23:13:06 -0400 Message-Id: <20210903031306.78292-3-desmondcheongzx@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210903031306.78292-1-desmondcheongzx@gmail.com> References: <20210903031306.78292-1-desmondcheongzx@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Before freeing struct sco_conn, all delayed timeout work should be cancelled. Otherwise, sco_sock_timeout could potentially use the sco_conn after it has been freed. Additionally, sco_conn.timeout_work should be initialized when the connection is allocated, not when the channel is added. This is because an sco_conn can create channels with multiple sockets over its lifetime, which happens if sockets are released but the connection isn't deleted. Fixes: ba316be1b6a0 ("Bluetooth: schedule SCO timeouts with delayed_work") Signed-off-by: Desmond Cheong Zhi Xi --- net/bluetooth/sco.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c index 4a057f99b60a..6e047e178c0a 100644 --- a/net/bluetooth/sco.c +++ b/net/bluetooth/sco.c @@ -133,6 +133,7 @@ static struct sco_conn *sco_conn_add(struct hci_conn *hcon) return NULL; spin_lock_init(&conn->lock); + INIT_DELAYED_WORK(&conn->timeout_work, sco_sock_timeout); hcon->sco_data = conn; conn->hcon = hcon; @@ -197,11 +198,11 @@ static void sco_conn_del(struct hci_conn *hcon, int err) sco_chan_del(sk, err); release_sock(sk); sock_put(sk); - - /* Ensure no more work items will run before freeing conn. */ - cancel_delayed_work_sync(&conn->timeout_work); } + /* Ensure no more work items will run before freeing conn. */ + cancel_delayed_work_sync(&conn->timeout_work); + hcon->sco_data = NULL; kfree(conn); } @@ -214,8 +215,6 @@ static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, sco_pi(sk)->conn = conn; conn->sk = sk; - INIT_DELAYED_WORK(&conn->timeout_work, sco_sock_timeout); - if (parent) bt_accept_enqueue(parent, sk, true); } -- 2.25.1