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tty: Fix SIGTTOU not sent with tcflush()

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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.

Cc: stable@vger.kernel.org # v3.10+
Reported-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2013-09-25 20:13:04 -04:00 committed by Greg Kroah-Hartman
parent 93a8d4163e
commit 5cec7bf699
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/tty_ioctl.c
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@ -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 */