add support for unlimited allowance to ERC20Burnable

OpenZeppelin · Feb 7, 2022 · 5527d66 · 5527d66
1 parent 7bf3143
commit 5527d66
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/contracts/token/ERC20/extensions/ERC20Burnable.sol b/contracts/token/ERC20/extensions/ERC20Burnable.sol
@@ -34,9 +34,11 @@ abstract contract ERC20Burnable is Context, ERC20 {
      */
     function burnFrom(address account, uint256 amount) public virtual {
         uint256 currentAllowance = allowance(account, _msgSender());
-        require(currentAllowance >= amount, "ERC20: burn amount exceeds allowance");
-        unchecked {
-            _approve(account, _msgSender(), currentAllowance - amount);
+        if (currentAllowance != type(uint256).max) {
+            require(currentAllowance >= amount, "ERC20: burn amount exceeds allowance");
+            unchecked {
+                _approve(account, _msgSender(), currentAllowance - amount);
+            }
         }
         _burn(account, amount);
     }