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check return data length for tokens

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poma 2019-11-03 11:25:58 +03:00
parent 8a179b9217
commit c00e553299
1 changed files with 2 additions and 0 deletions
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2
contracts/ERC20Mixer.sol
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@ -57,6 +57,7 @@ contract ERC20Mixer is Mixer {
// if contract returns some data let's make sure that is `true` according to standard // if contract returns some data let's make sure that is `true` according to standard
if (data.length > 0) { if (data.length > 0) {
require(data.length == 32, "data length should be either 0 or 32 bytes");
assembly { assembly {
success := mload(add(data, 0x20)) success := mload(add(data, 0x20))
} }
@ -78,6 +79,7 @@ contract ERC20Mixer is Mixer {
// if contract returns some data let's make sure that is `true` according to standard // if contract returns some data let's make sure that is `true` according to standard
if (data.length > 0) { if (data.length > 0) {
require(data.length == 32, "data length should be either 0 or 32 bytes");
assembly { assembly {
success := mload(add(data, 0x20)) success := mload(add(data, 0x20))
} }