tty: Avoid possible error pointer dereference at tty_ldisc_restore().

syzbot is reporting crashes [1] triggered by memory allocation failure at
tty_ldisc_get() from tty_ldisc_restore(). While syzbot stops at WARN_ON()
due to panic_on_warn == true, panic_on_warn == false will after all trigger
an OOPS by dereferencing old->ops->num if IS_ERR(old) == true.

We can simplify tty_ldisc_restore() as three calls (old->ops->num, N_TTY,
N_NULL) to tty_ldisc_failto() in addition to avoiding possible error
pointer dereference.

If someone reports kernel panic triggered by forcing all memory allocations
for tty_ldisc_restore() to fail, we can consider adding __GFP_NOFAIL for
tty_ldisc_restore() case.

[1] https://syzkaller.appspot.com/bug?id=6ac359c61e71d22e06db7f8f88243feb11d927e7

Reported-by: syzbot+40b7287c2dc987c48c81@syzkaller.appspotmail.com
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Alan Cox <alan@llwyncelyn.cymru>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 050f4d6..c1cf6cb 100644 (file)
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -527,19 +527,16 @@ static int tty_ldisc_failto(struct tty_struct *tty, int ld)
 static void tty_ldisc_restore(struct tty_struct *tty, struct tty_ldisc *old)
 {
        /* There is an outstanding reference here so this is safe */
-       old = tty_ldisc_get(tty, old->ops->num);
-       WARN_ON(IS_ERR(old));
-       tty->ldisc = old;
-       tty_set_termios_ldisc(tty, old->ops->num);
-       if (tty_ldisc_open(tty, old) < 0) {
-               tty_ldisc_put(old);
+       if (tty_ldisc_failto(tty, old->ops->num) < 0) {
+               const char *name = tty_name(tty);
+
+               pr_warn("Falling back ldisc for %s.\n", name);
                /* The traditional behaviour is to fall back to N_TTY, we
                   want to avoid falling back to N_NULL unless we have no
                   choice to avoid the risk of breaking anything */
                if (tty_ldisc_failto(tty, N_TTY) < 0 &&
                    tty_ldisc_failto(tty, N_NULL) < 0)
-                       panic("Couldn't open N_NULL ldisc for %s.",
-                             tty_name(tty));
+                       panic("Couldn't open N_NULL ldisc for %s.", name);
        }
 }