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common/hexutil: reject big integer inputs > 256 bits

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This follows the change to common/math big integer parsing in PR #3699.
This commit is contained in:
Felix Lange
2017-02-22 17:35:11 +01:00
parent c52ab932e6
commit f3b7dcc5bd
4 changed files with 30 additions and 3 deletions
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12
common/hexutil/json.go
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@ -91,9 +91,12 @@ func UnmarshalJSON(typname string, input, out []byte) error {
return nil
}
// Big marshals/unmarshals as a JSON string with 0x prefix. The zero value marshals as
// "0x0". Negative integers are not supported at this time. Attempting to marshal them
// will return an error.
// Big marshals/unmarshals as a JSON string with 0x prefix.
// The zero value marshals as "0x0".
//
// Negative integers are not supported at this time. Attempting to marshal them will
// return an error. Values larger than 256bits are rejected by Unmarshal but will be
// marshaled without error.
type Big big.Int
// MarshalJSON implements json.Marshaler.
@ -119,6 +122,9 @@ func (b *Big) UnmarshalJSON(input []byte) error {
if err != nil {
return err
}
if len(raw) > 64 {
return ErrBig256Range
}
words := make([]big.Word, len(raw)/bigWordNibbles+1)
end := len(raw)
for i := range words {