Commit 5c83e07c authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman

USB: serial: mos7720: fix parport use-after-free on probe errors

commit 75dd211e upstream.

Do not submit the interrupt URB until after the parport has been
successfully registered to avoid another use-after-free in the
completion handler when accessing the freed parport private data in case
of a racing completion.

Fixes: b69578df ("USB: usbserial: mos7720: add support for parallel port on moschip 7715")
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2f525ed5
......@@ -1955,22 +1955,20 @@ static int mos7720_startup(struct usb_serial *serial)
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
(__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000);
/* start the interrupt urb */
ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
if (ret_val)
dev_err(&dev->dev,
"%s - Error %d submitting control urb\n",
__func__, ret_val);
#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
if (product == MOSCHIP_DEVICE_ID_7715) {
ret_val = mos7715_parport_init(serial);
if (ret_val < 0) {
usb_kill_urb(serial->port[0]->interrupt_in_urb);
if (ret_val < 0)
return ret_val;
}
}
#endif
/* start the interrupt urb */
ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
if (ret_val) {
dev_err(&dev->dev, "failed to submit interrupt urb: %d\n",
ret_val);
}
/* LSR For Port 1 */
read_mos_reg(serial, 0, MOS7720_LSR, &data);
dev_dbg(&dev->dev, "LSR:%x\n", data);
......
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