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>

diff --git a/src/mds/cephfs_features.cc b/src/mds/cephfs_features.cc
index 09c9c010399e973dac103c30b63f194990051513..7469e49081484554330e596f468ba39c207ec7c3 100644 (file)
--- 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;