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tun: fix Device.Read() buf length assumption on Windows

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The length of a packet read from the underlying TUN device may exceed
the length of a supplied buffer when MTU exceeds device.MaxMessageSize.

Reviewed-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Signed-off-by: Jordan Whited <jordan@tailscale.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jordan Whited 2023-11-08 14:06:20 -08:00 committed by Jason A. Donenfeld
parent 2e0774f246
commit 1cf89f5339
1 changed files with 3 additions and 4 deletions
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7
tun/tun_windows.go
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@ -160,11 +160,10 @@ retry:
packet, err := tun.session.ReceivePacket()
switch err {
case nil:
packetSize := len(packet)
copy(bufs[0][offset:], packet)
sizes[0] = packetSize
n := copy(bufs[0][offset:], packet)
sizes[0] = n
tun.session.ReleaseReceivePacket(packet)
tun.rate.update(uint64(packetSize))
tun.rate.update(uint64(n))
return 1, nil
case windows.ERROR_NO_MORE_ITEMS:
if !shouldSpin || uint64(nanotime()-start) >= spinloopDuration {