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p2p/enr: check size limit when decoding

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This commit is contained in:
Felix Lange 2017-12-07 12:31:26 +01:00
parent 617f9e64f8
commit 67301a1c23
1 changed files with 4 additions and 5 deletions
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9
p2p/enr/enr.go
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@ -33,11 +33,7 @@ import (
"github.com/ethereum/go-ethereum/rlp" "github.com/ethereum/go-ethereum/rlp"
) )
const ( const SizeLimit = 300 // maximum encoded size of a node record in bytes
// SizeLimit is the maximum encoded size of a node record in bytes.
// Implementations should reject records larger than this size.
SizeLimit = 300
)
var ( var (
errNoID = errors.New("unknown or unspecified identity scheme") errNoID = errors.New("unknown or unspecified identity scheme")
@ -140,6 +136,9 @@ func (r *Record) DecodeRLP(s *rlp.Stream) error {
if err != nil { if err != nil {
return err return err
} }
if len(raw) > SizeLimit {
return errTooBig
}
// Decode the RLP container. // Decode the RLP container.
dec := Record{raw: raw} dec := Record{raw: raw}