From: Matthias Reichl <hias@xxxxxxxxx>
commit 4466d6d2f80c1193e0845d110277c56da77a6418 upstream.
Commit 2ae0b31e0face ("tty: don't crash in tty_init_dev when missing
tty_port") didn't fully prevent the crash as the cleanup path in
tty_init_dev() calls release_tty() which dereferences tty->port
without checking it for non-null.
Add tty->port checks to release_tty to avoid the kernel crash.
Fixes: 2ae0b31e0face ("tty: don't crash in tty_init_dev when missing tty_port")
Signed-off-by: Matthias Reichl <hias@xxxxxxxxx>
Link: https://lore.kernel.org/r/20201105123432.4448-1-hias@xxxxxxxxx
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/tty_io.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1514,10 +1514,12 @@ static void release_tty(struct tty_struc
tty->ops->shutdown(tty);
tty_save_termios(tty);
tty_driver_remove_tty(tty->driver, tty);
- tty->port->itty = NULL;
+ if (tty->port)
+ tty->port->itty = NULL;
if (tty->link)
tty->link->port->itty = NULL;
- tty_buffer_cancel_work(tty->port);
+ if (tty->port)
+ tty_buffer_cancel_work(tty->port);
if (tty->link)
tty_buffer_cancel_work(tty->link->port);
