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/freebsd-11.0-release/sys/dev/pty/
H A Dpty.cdiff 77360 Mon May 28 20:22:12 MDT 2001 phk With the new kernel dev_t conversions done at release 4.X,
it becomes possible to trap in ptsstop() in kern/tty_pty.c
if the slave side has never been opened during the life of a kernel.

What happens is that calls to ttyflush() done from ptyioctl() for the
controlling side end up calling ptsstop() [via (*tp->t_stop)(tp, <X>)]
which evaluates the following:

struct pt_ioctl *pti = tp->t_dev->si_drv1;

In order for tp->t_dev to be set, the slave device must first be
opened in ttyopen() [kern/tty.c].

It appears that the only problem is calls to (*tp->t_stop)(tp, <n>),
so this could also happen with other ioctls initiated by the
controlling side before the slave has been opened.

PR: 27698
Submitted by: David Bein bein@netapp.com
MFC after: 6 days

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