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wgengine/magicsock: fix crash in Send when Endpoint isn't an AddrSet

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Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2020-02-24 08:47:20 -08:00
parent 868cfae84f
commit 7a3b91390b
1 changed files with 10 additions and 1 deletions
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11
wgengine/magicsock/magicsock.go
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@ -417,7 +417,16 @@ func appendDests(dsts []*net.UDPAddr, as *AddrSet, b []byte) (_ []*net.UDPAddr,
var errNoDestinations = errors.New("magicsock: no destinations")
func (c *Conn) Send(b []byte, ep conn.Endpoint) error {
as := ep.(*AddrSet)
var as *AddrSet
switch v := ep.(type) {
default:
panic(fmt.Sprintf("unexpected Endpoint type %T", v))
case *singleEndpoint:
_, err := c.pconn.WriteTo(b, (*net.UDPAddr)(v))
return err
case *AddrSet:
as = v
}
var addrBuf [8]*net.UDPAddr
dsts, roamAddr := appendDests(addrBuf[:0], as, b)