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tty: Drop tty->count on tty_reopen() failure

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commit fe32416790 upstream.

In case of tty_ldisc_reinit() failure, tty->count should be decremented
back, otherwise we will never release_tty().
Tetsuo reported that it fixes noisy warnings on tty release like:
  pts pts4033: tty_release: tty->count(10529) != (#fd's(7) + #kopen's(0))

Fixes: commit 892d1fa7ea ("tty: Destroy ldisc instance on hangup")

Cc: stable@vger.kernel.org # v4.6+
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Reviewed-by: Jiri Slaby <jslaby@suse.cz>
Tested-by: Jiri Slaby <jslaby@suse.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Safonov
2018-09-18 00:52:52 +01:00
committed by Greg Kroah-Hartman
parent c92e73b11e
commit 171f90d4ae
1 changed files with 8 additions and 3 deletions
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11
drivers/tty/tty_io.c
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@@ -1254,6 +1254,7 @@ static void tty_driver_remove_tty(struct tty_driver *driver, struct tty_struct *
static int tty_reopen(struct tty_struct *tty)
{
struct tty_driver *driver = tty->driver;
int retval;
if (driver->type == TTY_DRIVER_TYPE_PTY &&
driver->subtype == PTY_TYPE_MASTER)
@@ -1267,10 +1268,14 @@ static int tty_reopen(struct tty_struct *tty)
tty->count++;
if (!tty->ldisc)
return tty_ldisc_reinit(tty, tty->termios.c_line);
if (tty->ldisc)
return 0;
return 0;
retval = tty_ldisc_reinit(tty, tty->termios.c_line);
if (retval)
tty->count--;
return retval;
}
/**