From 15ba9dc9440b3d4b2849eaa333a59c6c4a2e04e6 Mon Sep 17 00:00:00 2001
From: Patrick Donnelly <pdonnell@redhat.com>
Date: Thu, 17 Dec 2020 08:59:46 -0800
Subject: [PATCH] mds: do not allow setting a reserved feature by name

Fixes: https://tracker.ceph.com/issues/48661
Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
---
 src/mds/cephfs_features.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/mds/cephfs_features.cc b/src/mds/cephfs_features.cc
index 09c9c010399..7469e490814 100644
--- a/src/mds/cephfs_features.cc
+++ b/src/mds/cephfs_features.cc
@@ -35,6 +35,9 @@ std::string_view cephfs_feature_name(size_t id)
 
 int cephfs_feature_from_name(std::string_view name)
 {
+  if (name == "reserved"sv) {
+    return -1;
+  }
   for (size_t i = 0; i < feature_names.size(); ++i) {
     if (name == feature_names[i])
       return i;
-- 
2.39.5