ink! is an embedded domain specific language to write smart contracts in Rust for blockchains built on the Substrate framework. Starting in version 4.0.0 and prior to version 4.2.1, the return value when using delegate call mechanics, either through CallBuilder::delegate or ink_env::invoke_contract_delegate, is decoded incorrectly. This bug was related to the mechanics around decoding a calls return buffer, which was changed as part of pull request 1450. Since this feature was only released in ink! 4.0.0, no previous versions are affected. Users who have an ink! 4.x series contract should upgrade to 4.2.1 to receive a patch.
The product incorrectly checks a return value from a function, which prevents it from detecting errors or exceptional conditions.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ink! | Parity | 4.0.0 (including) | 4.2.1 (excluding) |