From 73b278fe037bf94443dacf7885f292b85eb13e90 Mon Sep 17 00:00:00 2001
From: HAPPY <pcy190@126.com>
Date: Mon, 26 Aug 2024 13:56:30 +0000
Subject: [PATCH] fix gas check order in blake2 precompile

---
 crates/precompile/src/blake2.rs | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/crates/precompile/src/blake2.rs b/crates/precompile/src/blake2.rs
index 1b4ab9256a..6ecf55bebe 100644
--- a/crates/precompile/src/blake2.rs
+++ b/crates/precompile/src/blake2.rs
@@ -17,12 +17,6 @@ pub fn run(input: &Bytes, gas_limit: u64) -> PrecompileResult {
         return Err(Error::Blake2WrongLength.into());
     }
 
-    let f = match input[212] {
-        1 => true,
-        0 => false,
-        _ => return Err(Error::Blake2WrongFinalIndicatorFlag.into()),
-    };
-
     // rounds 4 bytes
     let rounds = u32::from_be_bytes(input[..4].try_into().unwrap()) as usize;
     let gas_used = rounds as u64 * F_ROUND;
@@ -30,6 +24,12 @@ pub fn run(input: &Bytes, gas_limit: u64) -> PrecompileResult {
         return Err(Error::OutOfGas.into());
     }
 
+    let f = match input[212] {
+        1 => true,
+        0 => false,
+        _ => return Err(Error::Blake2WrongFinalIndicatorFlag.into()),
+    };
+
     let mut h = [0u64; 8];
     let mut m = [0u64; 16];