ITS#7793 update branch key if needed

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 16f5855615e92d183feaf086a693871597d194a4..d8ac0406c6e055060578b360bff0ce881f00f051 100644 (file)
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -6056,6 +6056,22 @@ mdb_cursor_put(MDB_cursor *mc, MDB_val *key, MDB_val *data,
                                return MDB_BAD_VALSIZE;
                        ptr = LEAF2KEY(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], ksize);
                        memcpy(ptr, key->mv_data, ksize);
+fix_parent:
+                       /* if overwriting slot 0 of leaf, need to
+                        * update branch key if there is a parent page
+                        */
+                       if (mc->mc_top && !mc->mc_ki[mc->mc_top]) {
+                               unsigned short top = mc->mc_top;
+                               mc->mc_top--;
+                               /* slot 0 is always an empty key, needs no update */
+                               if (mc->mc_ki[mc->mc_top])
+                                       rc2 = mdb_update_key(mc, key);
+                               else
+                                       rc2 = MDB_SUCCESS;
+                               mc->mc_top = top;
+                               if (rc2)
+                                       return rc2;
+                       }
                        return MDB_SUCCESS;
                }
 
@@ -6261,8 +6277,10 @@ current:
                                data->mv_data = olddata.mv_data;
                        else if (!(mc->mc_flags & C_SUB))
                                memcpy(olddata.mv_data, data->mv_data, data->mv_size);
-                       else
+                       else {
                                memcpy(NODEKEY(leaf), key->mv_data, key->mv_size);
+                               goto fix_parent;
+                       }
                        return MDB_SUCCESS;
                }
                mdb_node_del(mc, 0);