From 9e45284984096314994777f27e1446dfbfd2f0d7 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Sun, 8 May 2016 20:08:01 +0200 Subject: USB: serial: mxuport: fix use-after-free in probe error path The interface read and event URBs are submitted in attach, but were never explicitly unlinked by the driver. Instead the URBs would have been killed by usb-serial core on disconnect. In case of a late probe error (e.g. due to failed minor allocation), disconnect is never called and we could end up with active URBs for an unbound interface. This in turn could lead to deallocated memory being dereferenced in the completion callbacks. Fixes: ee467a1f2066 ("USB: serial: add Moxa UPORT 12XX/14XX/16XX driver") Cc: stable # v3.14 Signed-off-by: Johan Hovold Acked-by: Greg Kroah-Hartman --- drivers/usb/serial/mxuport.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/usb') diff --git a/drivers/usb/serial/mxuport.c b/drivers/usb/serial/mxuport.c index 31a8b47f1ac6..c6596cbcc4b6 100644 --- a/drivers/usb/serial/mxuport.c +++ b/drivers/usb/serial/mxuport.c @@ -1259,6 +1259,15 @@ static int mxuport_attach(struct usb_serial *serial) return 0; } +static void mxuport_release(struct usb_serial *serial) +{ + struct usb_serial_port *port0 = serial->port[0]; + struct usb_serial_port *port1 = serial->port[1]; + + usb_serial_generic_close(port1); + usb_serial_generic_close(port0); +} + static int mxuport_open(struct tty_struct *tty, struct usb_serial_port *port) { struct mxuport_port *mxport = usb_get_serial_port_data(port); @@ -1361,6 +1370,7 @@ static struct usb_serial_driver mxuport_device = { .probe = mxuport_probe, .port_probe = mxuport_port_probe, .attach = mxuport_attach, + .release = mxuport_release, .calc_num_ports = mxuport_calc_num_ports, .open = mxuport_open, .close = mxuport_close, -- cgit v1.2.3