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-rw-r--r--fs/nfs/super.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 9c85cdb353aa..f3a95df4b95f 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1338,6 +1338,16 @@ static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
/*
+ * Certain releases of Linux's mountd return an empty
+ * flavor list. To prevent behavioral regression with
+ * these servers (ie. rejecting mounts that used to
+ * succeed), revert to pre-2.6.32 behavior (no checking)
+ * if the returned flavor list is empty.
+ */
+ if (server_authlist_len == 0)
+ return 0;
+
+ /*
* We avoid sophisticated negotiating here, as there are
* plenty of cases where we can get it wrong, providing
* either too little or too much security.
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