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[76.176.3.80]) by smtp.gmail.com with ESMTPSA id v89sm1134164pfk.12.2019.01.29.21.39.30 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 29 Jan 2019 21:39:30 -0800 (PST) Date: Tue, 29 Jan 2019 21:39:28 -0800 From: Myungho Jung To: Marcel Holtmann , Johan Hedberg Cc: linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2] Bluetooth: Add NULL check for tiocmget() and tiocmset() Message-ID: <20190130053925.GA26699@myunghoj-Precision-5530> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-bluetooth-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org tiocmget() and tiocmset() operations are optional and some tty drivers like pty miss the operations. We need NULL check to prevent from dereference. Signed-off-by: Myungho Jung --- drivers/bluetooth/hci_ath.c | 6 ++++++ drivers/bluetooth/hci_ldisc.c | 4 ++++ 2 files changed, 10 insertions(+) diff --git a/drivers/bluetooth/hci_ath.c b/drivers/bluetooth/hci_ath.c index d568fbd94d6c..fb9f6323a911 100644 --- a/drivers/bluetooth/hci_ath.c +++ b/drivers/bluetooth/hci_ath.c @@ -185,8 +185,14 @@ static int ath_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr) static int ath_setup(struct hci_uart *hu) { + struct tty_struct *tty = hu->tty; + BT_DBG("hu %p", hu); + /* tty driver should support operations to set RTS */ + if (!tty->driver->ops->tiocmget || !tty->driver->ops->tiocmset) + return -EOPNOTSUPP; + hu->hdev->set_bdaddr = ath_set_bdaddr; return 0; diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c index fbf7b4df23ab..cb31c2d8d826 100644 --- a/drivers/bluetooth/hci_ldisc.c +++ b/drivers/bluetooth/hci_ldisc.c @@ -314,6 +314,10 @@ void hci_uart_set_flow_control(struct hci_uart *hu, bool enable) return; } + /* tiocmget() and tiocmset() operations are optional */ + if (!tty->driver->ops->tiocmget || !tty->driver->ops->tiocmset) + return; + if (enable) { /* Disable hardware flow control */ ktermios = tty->termios; -- 2.17.1