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misc: bcm-vk: fix tty registration race 

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: 91ca10d6fa ("misc: bcm-vk: add ttyVK support")
Cc: stable@vger.kernel.org      # 5.12
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210917115736.5816-1-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2021-09-17 13:57:36 +02:00 committed by Greg Kroah-Hartman
parent 50c7ad36e6
commit d9d1232b48
1 changed files with 3 additions and 3 deletions
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6
drivers/misc/bcm-vk/bcm_vk_tty.c
View File

@ -267,13 +267,13 @@ int bcm_vk_tty_init(struct bcm_vk *vk, char *name)
struct device *tty_dev;
tty_port_init(&vk->tty[i].port);
tty_dev = tty_port_register_device(&vk->tty[i].port, tty_drv,
i, dev);
tty_dev = tty_port_register_device_attr(&vk->tty[i].port,
tty_drv, i, dev, vk,
NULL);
if (IS_ERR(tty_dev)) {
err = PTR_ERR(tty_dev);
goto unwind;
}
dev_set_drvdata(tty_dev, vk);
vk->tty[i].is_opened = false;
}