From 3e74681e779e74391d4116dedfcd77aadfe1579c Mon Sep 17 00:00:00 2001
From: Hadrien Croubois <hadrien.croubois@gmail.com>
Date: Wed, 23 Feb 2022 15:28:44 +0100
Subject: [PATCH] Read allowance from overridable function in increase/decrease
 (#3213)

---
 contracts/token/ERC20/ERC20.sol | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/contracts/token/ERC20/ERC20.sol b/contracts/token/ERC20/ERC20.sol
index 7701cbd74..dc963af88 100644
--- a/contracts/token/ERC20/ERC20.sol
+++ b/contracts/token/ERC20/ERC20.sol
@@ -180,7 +180,7 @@ contract ERC20 is Context, IERC20, IERC20Metadata {
      */
     function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
         address owner = _msgSender();
-        _approve(owner, spender, _allowances[owner][spender] + addedValue);
+        _approve(owner, spender, allowance(owner, spender) + addedValue);
         return true;
     }
 
@@ -200,7 +200,7 @@ contract ERC20 is Context, IERC20, IERC20Metadata {
      */
     function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
         address owner = _msgSender();
-        uint256 currentAllowance = _allowances[owner][spender];
+        uint256 currentAllowance = allowance(owner, spender);
         require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
         unchecked {
             _approve(owner, spender, currentAllowance - subtractedValue);