Commit dff7ce16 authored by Johan Hovold's avatar Johan Hovold Committed by Sasha Levin

USB: serial: quatech2: fix use-after-free in probe error path

[ Upstream commit 028c49f5 ]

The interface read URB is submitted in attach, but was only unlinked by
the driver at disconnect.

In case of a late probe error (e.g. due to failed minor allocation),
disconnect is never called and we would end up with active URBs for an
unbound interface. This in turn could lead to deallocated memory being
dereferenced in the completion callback.

Fixes: f7a33e60 ("USB: serial: add quatech2 usb to serial driver")
Cc: stable <stable@vger.kernel.org>	# v3.5: 40d04738Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
parent aa1ebad2
......@@ -141,6 +141,7 @@ static void qt2_release(struct usb_serial *serial)
serial_priv = usb_get_serial_data(serial);
usb_kill_urb(serial_priv->read_urb);
usb_free_urb(serial_priv->read_urb);
kfree(serial_priv->read_buffer);
kfree(serial_priv);
......
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