kv: fix iterator bug in prev

Signed-off-by: Haodong Tang <haodong.tang@intel.com>

diff --git a/src/kv/MemDB.cc b/src/kv/MemDB.cc
index b0563882c83f5643d8b639f8e3a06e188391d68d..9e6c4c670921aef1a2592b9412af2eefc88d904b 100644 (file)
--- a/src/kv/MemDB.cc
+++ b/src/kv/MemDB.cc
@@ -478,8 +478,8 @@ int MemDB::MDBWholeSpaceIteratorImpl:: prev()
     return -1;
   }
   free_last();
-  m_iter--;
-  if (m_iter != m_btree_p->end()) {
+  if (m_iter != m_btree_p->begin()) {
+    m_iter--;
     fill_current();
     return 0;
   } else {