1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/char/pty.c b/drivers/char/pty.c
index 5acd29e6e043..3910ce112a95 100644
--- a/drivers/char/pty.c
+++ b/drivers/char/pty.c
@@ -104,7 +104,7 @@ static int pty_write(struct tty_struct *tty, const unsigned char *buf,
         struct tty_struct *to = tty->link;
         int     c;
 
-        if (!to || tty->stopped)
+        if (!to || !to->ldisc || tty->stopped)
                 return 0;
 
         c = to->receive_room;
@@ -148,7 +148,7 @@ static int pty_chars_in_buffer(struct tty_struct *tty)
         int count;
 
         /* We should get the line discipline lock for "tty->link" */
-        if (!to || !to->ldisc->ops->chars_in_buffer)
+        if (!to || !to->ldisc || !to->ldisc->ops->chars_in_buffer)
                 return 0;
 
         /* The ldisc must report 0 if no characters available to be read */
@@ -183,7 +183,7 @@ static void pty_flush_buffer(struct tty_struct *tty)
         struct tty_struct *to = tty->link;
         unsigned long flags;
 
-        if (!to)
+        if (!to || !to->ldisc)
                 return;
 
         if (to->ldisc->ops->flush_buffer)