1 files changed, 18 insertions, 0 deletions

diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index 6ee9bf69a7a6..b1024bcc65c8 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -453,6 +453,14 @@ static void nfs4_swap_callback_idents(struct nfs_client *keep,
         spin_unlock(&nn->nfs_client_lock);
 }
 
+static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
+                const struct nfs_client *clp2)
+{
+        if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
+                return true;
+        return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
+}
+
 /**
  * nfs40_walk_client_list - Find server that recognizes a client ID
  *
@@ -511,6 +519,9 @@ int nfs40_walk_client_list(struct nfs_client *new,
                 if (pos->cl_clientid != new->cl_clientid)
                         continue;
 
+                if (!nfs4_match_client_owner_id(pos, new))
+                        continue;
+
                 atomic_inc(&pos->cl_count);
                 spin_unlock(&nn->nfs_client_lock);
 
@@ -657,6 +668,13 @@ int nfs41_walk_client_list(struct nfs_client *new,
                 if (!nfs4_check_clientid_trunking(pos, new))
                         continue;
 
+                /* Unlike NFSv4.0, we know that NFSv4.1 always uses the
+                 * uniform string, however someone might switch the
+                 * uniquifier string on us.
+                 */
+                if (!nfs4_match_client_owner_id(pos, new))
+                        continue;
+
                 atomic_inc(&pos->cl_count);
                 *result = pos;
                 status = 0;