[PATCH v3 17/20] afs: Fix vllist leak

[David Howells <dhowells@redhat.com>]

Fix a leak of the new vllist in afs_update_cell() in the event that it is an
empty list (nr_servers == 0), in which case the old list isn't displaced
unless the old list is also empty.

Fixes: d5c32c89b208 ("afs: Fix cell DNS lookup")
Closes: https://sashiko.dev/#/patchset/20260609081738.770127-1-dhowells%40redhat.com
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
---
 fs/afs/cell.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/afs/cell.c b/fs/afs/cell.c
index e0fab1609f27..fbb8a43aa7cd 100644
--- a/fs/afs/cell.c
+++ b/fs/afs/cell.c
@@ -547,6 +547,8 @@ static int afs_update_cell(struct afs_cell *cell)
 		rcu_assign_pointer(cell->vl_servers, vllist);
 		cell->dns_source = vllist->source;
 		old = p;
+	} else {
+		old = vllist;
 	}
 	write_unlock(&cell->vl_servers_lock);
 	afs_put_vlserverlist(cell->net, old);