diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2013-09-25 20:13:04 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-05 07:17:55 -0700 |
| commit | e49b753ccf809150dc686e2a313e20774db5ffec (patch) | |
| tree | 4382e22615e86595cf049e2856a68bcd68f4a816 | |
| parent | edc46d2142aaa5d46dd2475f4a1f948b11607cd0 (diff) | |
tty: Fix SIGTTOU not sent with tcflush()
commit 5cec7bf699c61d14f0538345076480bb8c8ebfbb upstream.
Commit 'e7f3880cd9b98c5bf9391ae7acdec82b75403776'
tty: Fix recursive deadlock in tty_perform_flush()
introduced a regression where tcflush() does not generate
SIGTTOU for background process groups.
Make sure ioctl(TCFLSH) calls tty_check_change() when
invoked from the line discipline.
Reported-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/tty_ioctl.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c index 3500d4114147..088b4ca7d805 100644 --- a/drivers/tty/tty_ioctl.c +++ b/drivers/tty/tty_ioctl.c @@ -1201,6 +1201,9 @@ int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, } return 0; case TCFLSH: + retval = tty_check_change(tty); + if (retval) + return retval; return __tty_perform_flush(tty, arg); default: /* Try the mode commands */ |