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serdev: ttyport: restore client ops on deregistration 

The serdev tty-port controller driver should reset the tty-port client
operations also on deregistration to avoid a NULL-pointer dereference in
case the port is later re-registered as a normal tty device.

Note that this can only happen with tty drivers such as 8250 which have
statically allocated port structures that can end up being reused and
where a later registration would not register a serdev controller (e.g.
due to registration errors or if the devicetree has been changed in
between).

Specifically, this can be an issue for any statically defined ports that
would be registered by 8250 core when an 8250 driver is being unbound.

Fixes: bed35c6dfa ("serdev: add a tty port controller driver")
Cc: stable <stable@vger.kernel.org>     # 4.11
Reported-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20200210145730.22762-1-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2020-02-10 15:57:30 +01:00 committed by Greg Kroah-Hartman
parent 87c5cbf71e
commit 0c5aae5927
3 changed files with 7 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/tty/serdev/serdev-ttyport.c
View File

@ -265,7 +265,6 @@ struct device *serdev_tty_port_register(struct tty_port *port,
struct device *parent,
struct tty_driver *drv, int idx)
{
const struct tty_port_client_operations *old_ops;
struct serdev_controller *ctrl;
struct serport *serport;
int ret;
@ -284,7 +283,6 @@ struct device *serdev_tty_port_register(struct tty_port *port,
ctrl->ops = &ctrl_ops;
old_ops = port->client_ops;
port->client_ops = &client_ops;
port->client_data = ctrl;
@ -297,7 +295,7 @@ struct device *serdev_tty_port_register(struct tty_port *port,
err_reset_data:
port->client_data = NULL;
port->client_ops = old_ops;
port->client_ops = &tty_port_default_client_ops;
serdev_controller_put(ctrl);
return ERR_PTR(ret);
@ -312,8 +310,8 @@ int serdev_tty_port_unregister(struct tty_port *port)
return -ENODEV;
serdev_controller_remove(ctrl);
port->client_ops = NULL;
port->client_data = NULL;
port->client_ops = &tty_port_default_client_ops;
serdev_controller_put(ctrl);
return 0;

5
drivers/tty/tty_port.c
View File

@ -52,10 +52,11 @@ static void tty_port_default_wakeup(struct tty_port *port)
}
}
static const struct tty_port_client_operations default_client_ops = {
const struct tty_port_client_operations tty_port_default_client_ops = {
.receive_buf = tty_port_default_receive_buf,
.write_wakeup = tty_port_default_wakeup,
};
EXPORT_SYMBOL_GPL(tty_port_default_client_ops);
void tty_port_init(struct tty_port *port)
{
@ -68,7 +69,7 @@ void tty_port_init(struct tty_port *port)
spin_lock_init(&port->lock);
port->close_delay = (50 * HZ) / 100;
port->closing_wait = (3000 * HZ) / 100;
port->client_ops = &default_client_ops;
port->client_ops = &tty_port_default_client_ops;
kref_init(&port->kref);
}
EXPORT_SYMBOL(tty_port_init);

2
include/linux/tty.h
View File

@ -225,6 +225,8 @@ struct tty_port_client_operations {
void (*write_wakeup)(struct tty_port *port);
};
extern const struct tty_port_client_operations tty_port_default_client_ops;
struct tty_port {
struct tty_bufhead buf; /* Locked internally */
struct tty_struct *tty; /* Back pointer */