mds: add array bounds check for null dentry lease

diff --git a/src/mds/Server.cc b/src/mds/Server.cc
index efe5da438b3d58483a152ab33bc2637ab795acb4..011d99a12bbd2b789b5b568b3a34a701a5e37e0c 100644 (file)
--- a/src/mds/Server.cc
+++ b/src/mds/Server.cc
@@ -1696,7 +1696,7 @@ CInode* Server::rdlock_path_pin_ref(MDRequest *mdr, int n,
   int r = mdcache->path_traverse(mdr, 0, refpath, &mdr->dn[n], &mdr->in[n], MDS_TRAVERSE_FORWARD);
   if (r > 0) return false; // delayed
   if (r < 0) {  // error
-    if (r == -ENOENT && n == 0) {
+    if (r == -ENOENT && n == 0 && mdr->dn[n].size()) {
       reply_request(mdr, r, NULL, mdr->dn[n][mdr->dn[n].size()-1]);
     } else {
       reply_request(mdr, r);