From 9116aa422fdf505cd3bb9475c7429a0e262ba109 Mon Sep 17 00:00:00 2001
From: Andrew Raffensperger <raffy@me.com>
Date: Fri, 6 Dec 2024 01:28:18 -0800
Subject: [PATCH] fix parens on prefix mask

---
 contracts/scroll/ScrollVerifierHooks.sol | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/contracts/scroll/ScrollVerifierHooks.sol b/contracts/scroll/ScrollVerifierHooks.sol
index f2d0423c..33fbf244 100755
--- a/contracts/scroll/ScrollVerifierHooks.sol
+++ b/contracts/scroll/ScrollVerifierHooks.sol
@@ -130,10 +130,8 @@ contract ScrollVerifierHooks is IVerifierHooks {
                     // If the trie does not contain a value for key, the returned proof contains all
                     // nodes of the longest existing prefix of the key (at least the root node), ending
                     // with the node that proves the absence of the key.
-                    if (i > 0) {
-                        bytes32 p = bytes32(1 << (i - 1)); // prefix mask
-                        if ((temp & p) != (keyHash & p)) revert InvalidProof();
-                    }
+                    bytes32 p = bytes32((1 << i) - 1); // prefix mask
+                    if ((temp & p) != (keyHash & p)) revert InvalidProof();
                     // this is a proof for a different value that traverses to the same place
                     keyHash = temp;
                 }