From 913f4b1c3cec25aafa3493ce2b45d4e60522ccfb Mon Sep 17 00:00:00 2001
From: DhairyaSethi <55102840+DhairyaSethi@users.noreply.github.com>
Date: Wed, 16 Aug 2023 15:36:28 +0530
Subject: [PATCH] fix: zero address check for malformed tx sig

---
 contracts/root/predicates/IPredicate.sol | 1 +
 1 file changed, 1 insertion(+)

diff --git a/contracts/root/predicates/IPredicate.sol b/contracts/root/predicates/IPredicate.sol
index 9b50f8f66..a3c107607 100644
--- a/contracts/root/predicates/IPredicate.sol
+++ b/contracts/root/predicates/IPredicate.sol
@@ -96,6 +96,7 @@ contract PredicateUtils is ExitsDataStructure, ChainIdMixin {
             bytes32(txList[7].toUint()),
             bytes32(txList[8].toUint())
         );
+        require(signer != address(0), "Invalid signer");
     }
 
     function decodeExit(bytes memory data)