[PATCH] tty: clarify disassociate_ctty

The code to look at tty_old_pgrp and send SIGHUP and SIGCONT when it is
present only executes when disassociate_ctty is called from do_exit.  Make
this clear by adding an explict on_exit check, and explicitly setting
tty_old_pgrp to 0.

In addition fix the locking by reading tty_old_pgrp under the siglock.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index b9fce77c8f03..ac937f767f23 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1508,8 +1508,12 @@ void disassociate_ctty(int on_exit)
                 /* XXX: here we race, there is nothing protecting tty */
                 if (on_exit && tty->driver->type != TTY_DRIVER_TYPE_PTY)
                         tty_vhangup(tty);
-        } else {
-                pid_t old_pgrp = current->signal->tty_old_pgrp;
+        } else if (on_exit) {
+                pid_t old_pgrp;
+                spin_lock_irq(&current->sighand->siglock);
+                old_pgrp = current->signal->tty_old_pgrp;
+                current->signal->tty_old_pgrp = 0;
+                spin_unlock_irq(&current->sighand->siglock);
                 if (old_pgrp) {
                         kill_pg(old_pgrp, SIGHUP, on_exit);
                         kill_pg(old_pgrp, SIGCONT, on_exit);