3.9-stable review patch. If anyone has any objections, please let me know.
------------------ From: Peter Hurley <[email protected]> commit 7c61c3d8f44d5d822f758754287af644307b4af9 upstream. Commit 699390354da6c258b65bf8fa79cfd5feaede50b6 ('pty: Ignore slave pty close() if never successfully opened') introduced a bug with ptys whereby a write() in parallel with an open() on an existing pty could mistakenly indicate an I/O error. Only indicate an I/O error if the condition on open() actually exists. Reported-by: Markus Trippelsdorf <[email protected]> Signed-off-by: Peter Hurley <[email protected]> Tested-by: Mikael Pettersson <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/tty/pty.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) --- a/drivers/tty/pty.c +++ b/drivers/tty/pty.c @@ -244,14 +244,9 @@ static void pty_flush_buffer(struct tty_ static int pty_open(struct tty_struct *tty, struct file *filp) { - int retval = -ENODEV; - if (!tty || !tty->link) - goto out; - - set_bit(TTY_IO_ERROR, &tty->flags); + return -ENODEV; - retval = -EIO; if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) goto out; if (test_bit(TTY_PTY_LOCK, &tty->link->flags)) @@ -262,9 +257,11 @@ static int pty_open(struct tty_struct *t clear_bit(TTY_IO_ERROR, &tty->flags); clear_bit(TTY_OTHER_CLOSED, &tty->link->flags); set_bit(TTY_THROTTLED, &tty->flags); - retval = 0; + return 0; + out: - return retval; + set_bit(TTY_IO_ERROR, &tty->flags); + return -EIO; } static void pty_set_termios(struct tty_struct *tty, -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
