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Date: Fri, 17 Sep 2021 12:12:04 +0200 From: Johan Hovold <johan@...nel.org> To: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org> Cc: linux-usb@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>, stable@...r.kernel.org Subject: [PATCH net] net: hso: fix muxed tty registration If resource allocation and registration fail for a muxed tty device (e.g. if there are no more minor numbers) the driver should not try to deregister the never-registered (or already-deregistered) tty. Fix up the error handling to avoid dereferencing a NULL pointer when attempting to remove the character device. Fixes: 72dc1c096c70 ("HSO: add option hso driver") Cc: stable@...r.kernel.org # 2.6.27 Signed-off-by: Johan Hovold <johan@...nel.org> --- drivers/net/usb/hso.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c index a57251ba5991..f97813a4e8d1 100644 --- a/drivers/net/usb/hso.c +++ b/drivers/net/usb/hso.c @@ -2719,14 +2719,14 @@ struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface, serial = kzalloc(sizeof(*serial), GFP_KERNEL); if (!serial) - goto exit; + goto err_free_dev; hso_dev->port_data.dev_serial = serial; serial->parent = hso_dev; if (hso_serial_common_create (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE)) - goto exit; + goto err_free_serial; serial->tx_data_length--; serial->write_data = hso_mux_serial_write_data; @@ -2742,11 +2742,9 @@ struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface, /* done, return it */ return hso_dev; -exit: - if (serial) { - tty_unregister_device(tty_drv, serial->minor); - kfree(serial); - } +err_free_serial: + kfree(serial); +err_free_dev: kfree(hso_dev); return NULL; -- 2.32.0
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