afs: Fix afs_server_list to be cleaned up with RCU

[ Upstream commit e6bace7313d61e31f2b16fa3d774fd8cb3cb869e ]

afs_server_list is accessed with the rcu_read_lock() held from
volume->servers, so it needs to be cleaned up correctly.

Fix this by using kfree_rcu() instead of kfree().

Fixes: 8a070a964877 ("afs: Detect cell aliases 1 - Cells with root volumes")
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index da73b97..5041eae 100644 (file)
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -553,6 +553,7 @@ struct afs_server_entry {
 };
 
 struct afs_server_list {
+       struct rcu_head         rcu;
        afs_volid_t             vids[AFS_MAXTYPES]; /* Volume IDs */
        refcount_t              usage;
        unsigned char           nr_servers;

diff --git a/fs/afs/server_list.c b/fs/afs/server_list.c
index ed90567..b59896b 100644 (file)
--- a/fs/afs/server_list.c
+++ b/fs/afs/server_list.c
@@ -17,7 +17,7 @@ void afs_put_serverlist(struct afs_net *net, struct afs_server_list *slist)
                for (i = 0; i < slist->nr_servers; i++)
                        afs_unuse_server(net, slist->servers[i].server,
                                         afs_server_trace_put_slist);
-               kfree(slist);
+               kfree_rcu(slist, rcu);
        }
 }