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dns: return error when there's not enough length for rdata. #55

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nadoo 2018-09-01 23:44:47 +08:00
parent 981d226bd1
commit 1b4489cd67
1 changed files with 5 additions and 0 deletions
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5
dns/message.go
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@ -381,6 +381,11 @@ func (m *Message) UnmarshalRR(start int, rr *RR) (n int, err error) {
rr.CLASS = binary.BigEndian.Uint16(p[n+2:])
rr.TTL = binary.BigEndian.Uint32(p[n+4:])
rr.RDLENGTH = binary.BigEndian.Uint16(p[n+8:])
if len(p) <= n+10+int(rr.RDLENGTH) {
return 0, errors.New("UnmarshalRR: not enough data for RDATA")
}
rr.RDATA = p[n+10 : n+10+int(rr.RDLENGTH)]
if rr.TYPE == QTypeA {