Commit 0164bf02 authored Mar 04, 2015 by Jeff Layton

locks: fix fasync_struct memory leak in lease upgrade/downgrade handling

Commit 8634b51f (locks: convert lease handling to file_lock_context)
introduced a regression in the handling of lease upgrade/downgrades.

In the event that we already have a lease on a file and are going to
either upgrade or downgrade it, we skip doing any list insertion or
deletion and simply re-call lm_setup on the existing lease.

As of commit 8634b51f however, we end up calling lm_setup on the
lease that was passed in, instead of on the existing lease. This causes
us to leak the fasync_struct that was allocated in the event that there
was not already an existing one (as it always appeared that there
wasn't one).

Fixes: 8634b51f (locks: convert lease handling to file_lock_context)
Reported-and-Tested-by: Daniel Wagner <daniel.wagner@bmw-carit.de>
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>

parent 6587457b

fs/locks.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -1665,7 +1665,8 @@ generic_add_lease(struct file filp, long arg, struct file_lock flp, void *pr
		}

		if (my_fl != NULL) {
		error = lease->fl_lmops->lm_change(my_fl, arg, &dispose);
		lease = my_fl;
		error = lease->fl_lmops->lm_change(lease, arg, &dispose);
		if (error)
		goto out;
		goto out_setup;