diff options
| author | Alan Cox <alan@redhat.com> | 2009-01-15 14:30:25 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-15 21:48:35 +0100 |
| commit | c0253eec2a8e1140dd9672a1efe095cdcf5811d0 (patch) | |
| tree | c48dc5283ca4f01005295a97a28e532818aedce6 /drivers/char/tty_ioctl.c | |
| parent | Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/po... (diff) | |
| download | linux-c0253eec2a8e1140dd9672a1efe095cdcf5811d0.tar.xz linux-c0253eec2a8e1140dd9672a1efe095cdcf5811d0.zip | |
tty: Fix race in the flush for some ldiscs
If you issue an ioctl to flush a tty as the line discipline is changing or
otherwise unplugged you can get a crash. The bug is very old but the rest
of the BKL lock dropping and some very "good" luck on Ingo's part caught
an example.
Use the correct ldisc_ref form so that we wait for the ldisc change to
complete and then flush
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/tty_ioctl.c')
| -rw-r--r-- | drivers/char/tty_ioctl.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c index a408c8e487ec..6f4c7d0a53bf 100644 --- a/drivers/char/tty_ioctl.c +++ b/drivers/char/tty_ioctl.c @@ -1057,7 +1057,7 @@ int tty_perform_flush(struct tty_struct *tty, unsigned long arg) if (retval) return retval; - ld = tty_ldisc_ref(tty); + ld = tty_ldisc_ref_wait(tty); switch (arg) { case TCIFLUSH: if (ld && ld->ops->flush_buffer) |