From 739428a3320b8459b209e75efc864400692f3da5 Mon Sep 17 00:00:00 2001
From: Justin Starry <justin@solana.com>
Date: Tue, 20 Oct 2020 17:38:23 +0800
Subject: [PATCH] Fix signature index check in secp256k1 verify

---
 sdk/src/secp256k1.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sdk/src/secp256k1.rs b/sdk/src/secp256k1.rs
index 4a62f5897c3f10..7ec450c947698d 100644
--- a/sdk/src/secp256k1.rs
+++ b/sdk/src/secp256k1.rs
@@ -72,7 +72,7 @@ pub fn verify_eth_addresses(
 
         // Parse out signature
         let signature_index = offsets.signature_instruction_index as usize;
-        if signature_index > instruction_datas.len() {
+        if signature_index >= instruction_datas.len() {
             return Err(Secp256k1Error::InvalidInstructionDataSize);
         }
         let signature_instruction = instruction_datas[signature_index];