From 0b87c84cdd3876375c7bc0d6255332195ff57f45 Mon Sep 17 00:00:00 2001
From: Sergey Vasilyev <swasilyev@gmail.com>
Date: Tue, 28 Apr 2020 01:12:57 +0300
Subject: [PATCH] Merkle tree panics when there's a single leaf - fix

---
 crypto-primitives/src/merkle_tree/mod.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/crypto-primitives/src/merkle_tree/mod.rs b/crypto-primitives/src/merkle_tree/mod.rs
index 1ea81b2..b76577a 100644
--- a/crypto-primitives/src/merkle_tree/mod.rs
+++ b/crypto-primitives/src/merkle_tree/mod.rs
@@ -268,6 +268,10 @@ fn log2(number: usize) -> usize {
 /// Returns the height of the tree, given the size of the tree.
 #[inline]
 fn tree_height(tree_size: usize) -> usize {
+    if tree_size == 1 {
+        return 1;
+    }
+
     log2(tree_size)
 }