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tty: don't crash in tty_init_dev when missing tty_port 

We currently warn the user when tty->port is not set in tty_init_dev
yet. The warning says that the kernel will crash later. And it really
will only few lines below at:
tty->port->itty = tty;

So be nice and avoid the crash -- return an error instead. And update
the warning.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Link: https://lore.kernel.org/r/20191122101721.7222-1-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2019-11-22 11:17:21 +01:00 committed by Greg Kroah-Hartman
parent 1250ed7114
commit 2ae0b31e0f
1 changed files with 6 additions and 3 deletions
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9
drivers/tty/tty_io.c
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@ -1344,9 +1344,12 @@ struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx)
if (!tty->port)
tty->port = driver->ports[idx];
WARN_RATELIMIT(!tty->port,
"%s: %s driver does not set tty->port. This will crash the kernel later. Fix the driver!\n",
__func__, tty->driver->name);
if (WARN_RATELIMIT(!tty->port,
"%s: %s driver does not set tty->port. This would crash the kernel. Fix the driver!\n",
__func__, tty->driver->name)) {
retval = -EINVAL;
goto err_release_lock;
}
retval = tty_ldisc_lock(tty, 5 * HZ);
if (retval)