From: Johan Hovold <johan@xxxxxxxxxx>
commit 65c001df517a7bf9be8621b53d43c89f426ce8d6 upstream.
Make sure to set the tty class-device driver data before registering the
tty to avoid having a racing open() dereference a NULL pointer.
Fixes: 9c1d784afc6f ("Staging: ipack/devices/ipoctal: Get rid of ipoctal_list.")
Cc: stable@xxxxxxxxxxxxxxx # 3.7
Acked-by: Samuel Iglesias Gonsalvez <siglesias@xxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210917114622.5412-3-johan@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/ipack/devices/ipoctal.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/ipack/devices/ipoctal.c
+++ b/drivers/ipack/devices/ipoctal.c
@@ -395,13 +395,13 @@ static int ipoctal_inst_slot(struct ipoc
spin_lock_init(&channel->lock);
channel->pointer_read = 0;
channel->pointer_write = 0;
- tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL);
+ tty_dev = tty_port_register_device_attr(&channel->tty_port, tty,
+ i, NULL, channel, NULL);
if (IS_ERR(tty_dev)) {
dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
tty_port_destroy(&channel->tty_port);
continue;
}
- dev_set_drvdata(tty_dev, channel);
}
/*
