[patch 21/37] fcntl(F_SETSIG) fix

[Greg KH]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Trond Myklebust <trond.myklebust@xxxxxxxxxx>

[PATCH] fcntl(F_SETSIG) fix

fcntl(F_SETSIG) no longer works on leases because
lease_release_private_callback() gets called as the lease is copied in
order to initialise it.

The problem is that lease_alloc() performs an unnecessary initialisation,
which sets the lease_manager_ops.  Avoid the problem by allocating the
target lease structure using locks_alloc_lock().

Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 fs/locks.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- linux-2.6.17.11.orig/fs/locks.c
+++ linux-2.6.17.11/fs/locks.c
@@ -1389,8 +1389,9 @@ static int __setlease(struct file *filp,
 	if (!leases_enable)
 		goto out;
 
-	error = lease_alloc(filp, arg, &fl);
-	if (error)
+	error = -ENOMEM;
+	fl = locks_alloc_lock();
+	if (fl == NULL)
 		goto out;
 
 	locks_copy_lock(fl, lease);
@@ -1398,6 +1399,7 @@ static int __setlease(struct file *filp,
 	locks_insert_lock(before, fl);
 
 	*flp = fl;
+	error = 0;
 out:
 	return error;
 }

--
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