Fix CURSOR_NEXT/PREV on emptied DB

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index a90d7d5..f52dda7 100644 (file)
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -4935,9 +4935,11 @@ fetchm:
        case MDB_NEXT:
        case MDB_NEXT_DUP:
        case MDB_NEXT_NODUP:
-               if (!(mc->mc_flags & C_INITIALIZED))
+               if (!(mc->mc_flags & C_INITIALIZED)) {
                        rc = mdb_cursor_first(mc, key, data);
-               else
+                       if (rc)
+                               break;
+               } else
                        rc = mdb_cursor_next(mc, key, data, op);
                break;
        case MDB_PREV:
@@ -4945,6 +4947,8 @@ fetchm:
        case MDB_PREV_NODUP:
                if (!(mc->mc_flags & C_INITIALIZED)) {
                        rc = mdb_cursor_last(mc, key, data);
+                       if (rc)
+                               break;
                        mc->mc_flags |= C_INITIALIZED;
                        mc->mc_ki[mc->mc_top]++;
                }