From 2172a8f5e39e4bfc02f2c522e207c1b02901e3c4 Mon Sep 17 00:00:00 2001
From: Matjaz Verbole <verbole@gmail.com>
Date: Mon, 3 Jul 2023 10:08:37 +0200
Subject: [PATCH] :bug: Fix verify proof function by checking if all sibling
 hashes were used.

---
 src/sparse_merkle_tree/smt.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/sparse_merkle_tree/smt.rs b/src/sparse_merkle_tree/smt.rs
index e8160f8..b8333f0 100644
--- a/src/sparse_merkle_tree/smt.rs
+++ b/src/sparse_merkle_tree/smt.rs
@@ -1402,6 +1402,11 @@ impl SparseMerkleTree {
         while !sorted_queries.is_empty() {
             let query = &sorted_queries.pop_front().unwrap();
             if query.is_zero_height() {
+                if next_sibling_hash != sibling_hashes.len() {
+                    return Err(SMTError::InvalidInput(String::from(
+                        "Not all sibling hashes were used",
+                    )));
+                }
                 return Ok(query.hash.clone());
             }