svn commit: r209989 - stable/8/sys/kern
Ed Schouten
ed at FreeBSD.org
Tue Jul 13 11:04:46 UTC 2010
Author: ed
Date: Tue Jul 13 11:04:46 2010
New Revision: 209989
URL: http://svn.freebsd.org/changeset/base/209989
Log:
MFC r209718:
Fix a race condition, where a TTY could be destroyed twice.
There are special cases where tty_rel_free() can be called twice in a
row, namely when closing and revoking the TTY at the same moment. Only
call destroy_dev_sched_cb() once.
Reported by: Jeremie Le Hen
Modified:
stable/8/sys/kern/tty.c
Directory Properties:
stable/8/sys/ (props changed)
stable/8/sys/amd64/include/xen/ (props changed)
stable/8/sys/cddl/contrib/opensolaris/ (props changed)
stable/8/sys/contrib/dev/acpica/ (props changed)
stable/8/sys/contrib/pf/ (props changed)
stable/8/sys/dev/xen/xenpci/ (props changed)
Modified: stable/8/sys/kern/tty.c
==============================================================================
--- stable/8/sys/kern/tty.c Tue Jul 13 10:32:43 2010 (r209988)
+++ stable/8/sys/kern/tty.c Tue Jul 13 11:04:46 2010 (r209989)
@@ -1020,7 +1020,8 @@ tty_rel_free(struct tty *tp)
tp->t_dev = NULL;
tty_unlock(tp);
- destroy_dev_sched_cb(dev, tty_dealloc, tp);
+ if (dev != NULL)
+ destroy_dev_sched_cb(dev, tty_dealloc, tp);
}
void
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