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check that the packet is large enough for the header encryption sample

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This commit is contained in:
Marten Seemann 2019-01-01 13:04:09 +07:00
parent 8b2eb76b75
commit ba45256b32
2 changed files with 29 additions and 10 deletions
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3
packet_unpacker.go
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@ -56,6 +56,9 @@ func (u *packetUnpacker) Unpack(hdr *wire.Header, data []byte) (*unpackedPacket,
return nil, err
}
hdrLen := int(hdr.ParsedLen())
if len(data) < hdrLen+4+16 {
return nil, fmt.Errorf("Packet too small. Expected at least 20 bytes after the header, got %d", len(data)-hdrLen)
}
// The packet number can be up to 4 bytes long, but we won't know the length until we decrypt it.
// 1. save a copy of the 4 bytes
origPNBytes := make([]byte, 4)