tty: handle NULL parameters in free_tty_struct()

We sometimes pass NULL pointers to free_tty_struct(). One example where it can happen is in the error handling code in pty_common_install(). Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
git-mirror · Aug 10, 2012 · dc6802a · dc6802a
1 parent 4ac5d70
commit dc6802a
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
@@ -181,6 +181,8 @@ struct tty_struct *alloc_tty_struct(void)
 
 void free_tty_struct(struct tty_struct *tty)
 {
+	if (!tty)
+		return;
 	if (tty->dev)
 		put_device(tty->dev);
 	kfree(tty->write_buf);