autofs-5.0.9 - amd lookup fix expire of external mounts

From: Ian Kent <raven@themaw.net>

When expiring a submount it's necessary to ensure that any triggers
that may have been mounted over the top of the submount by its parent
are umounted so umount_subtree_mounts() is called with the parent ap.

But this can lead to an out of order umount. So far this hasn't been
a problem but if this happens when expiring an amd mount that refers
to an external mount the amd mount structure can't be found (since
we are looking in the parent ap) and subsequently the external mount
doesn't get checked and umounted.

So restrict the call to umount_subtree_mounts() to umount only offset
mounts by passing is_autofs_fs as 1 always.
---
 daemon/automount.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/daemon/automount.c b/daemon/automount.c
index 9d9ba7b..a6a9321 100644
--- a/daemon/automount.c
+++ b/daemon/automount.c
@@ -628,7 +628,7 @@ int umount_multi(struct autofs_point *ap, const char *path, int incl)
 	 * parent may have mounted over top of us.
 	 */
 	if (ap->submount)
-		left += umount_subtree_mounts(ap->parent, path, is_autofs_fs);
+		left += umount_subtree_mounts(ap->parent, path, 1);
 
 	left += umount_subtree_mounts(ap, path, is_autofs_fs);