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Reinstate length/bounds check in tun.go

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This commit is contained in:
Neil Alexander 2018-11-06 22:35:28 +00:00
parent 0240375417
commit a3a53f92c3
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GPG Key ID: A02A2019A2BB0944
1 changed files with 5 additions and 5 deletions
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src/yggdrasil/tun.go
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@ -101,11 +101,11 @@ func (tun *tunDevice) read() error {
if tun.iface.IsTAP() {
o = tun_ETHER_HEADER_LENGTH
}
if buf[o]&0xf0 != 0x60 ||
n != 256*int(buf[o+4])+int(buf[o+5])+tun_IPv6_HEADER_LENGTH+o {
// Either not an IPv6 packet or not the complete packet for some reason
//panic("Should not happen in testing")
//continue
switch {
case buf[o]&0xf0 == 0x60 && n == 256*int(buf[o+4])+int(buf[o+5])+tun_IPv6_HEADER_LENGTH+o:
case buf[o]&0xf0 == 0x40 && n == 256*int(buf[o+2])+int(buf[o+3])+o:
default:
continue
}
if buf[o+6] == 58 {
// Found an ICMPv6 packet