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Refine r195509, instead of checking that vnode type is VBAD, that is

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set quite late in the revocation path, properly verify that vnode is
not doomed before calling VOP.

Reported and tested by:	Harald Schmalzbauer <h.schmalzbauer omnilan de>
MFC after:	3 days
This commit is contained in:
Konstantin Belousov 2009-10-10 21:17:30 +00:00
parent ab02d85f0d
commit 6728dc169d
1 changed files with 3 additions and 3 deletions
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6
sys/kern/kern_exit.c
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@ -340,10 +340,10 @@ exit1(struct thread *td, int rv)
if (ttyvp != NULL) {
sx_xunlock(&proctree_lock);
vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY);
if (ttyvp->v_type != VBAD)
if (vn_lock(ttyvp, LK_EXCLUSIVE) == 0) {
VOP_REVOKE(ttyvp, REVOKEALL);
VOP_UNLOCK(ttyvp, 0);
VOP_UNLOCK(ttyvp, 0);
}
sx_xlock(&proctree_lock);
}
}