From: Edwin Rodriguez <edwin.rodriguez1@ibm.com>
Date: Thu, 7 Aug 2025 18:27:18 +0000 (-0400)
Subject: mds/MDSMap: Enhance set_min_compat_client to validate iterator range before sorting... 
X-Git-Url: http://git.apps.os.sepia.ceph.com/?a=commitdiff_plain;h=ad8c68c0b26abcc6e971a8fdf6d98cc86ee60385;p=ceph.git

mds/MDSMap: Enhance set_min_compat_client to validate iterator range before sorting feature bits

Fixes: https://tracker.ceph.com/issues/72476
Signed-off-by: Edwin Rodriguez <edwin.rodriguez1@ibm.com>
---

diff --git a/src/mds/MDSMap.cc b/src/mds/MDSMap.cc
index 5e0af74797c5e..2d96c637d9c43 100644
--- a/src/mds/MDSMap.cc
+++ b/src/mds/MDSMap.cc
@@ -1336,7 +1336,14 @@ void MDSMap::set_min_compat_client(ceph_release_t version)
   else if (version >= ceph_release_t::jewel)
     bits.push_back(CEPHFS_FEATURE_JEWEL);
 
-  std::sort(bits.begin(), bits.end());
+  if (bits.size() >= 2) {  // Need at least 2 elements to sort
+    auto first = bits.begin();
+    auto last = bits.end();
+    if (first < last) {  // Validate iterator range
+      std::sort(first, last);
+    }
+  }
+
   required_client_features = feature_bitset_t(bits);
 }