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magicsock: work around race condition initializing .Regions[].

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Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
This commit is contained in:
Avery Pennarun 2020-05-28 03:42:03 -04:00
parent 7cd9ff3dde
commit 30e5c19214
1 changed files with 6 additions and 1 deletions
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7
wgengine/magicsock/magicsock.go
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@ -487,7 +487,12 @@ func (c *Conn) setNearestDERP(derpNum int) (wantDERP bool) {
// On change, notify all currently connected DERP servers and
// start connecting to our home DERP if we are not already.
c.logf("magicsock: home is now derp-%v (%v)", derpNum, c.derpMap.Regions[derpNum].RegionCode)
dr := c.derpMap.Regions[derpNum]
if dr == nil {
c.logf("[unexpected] magicsock: derpMap.Regions[%v] is nil", derpNum)
} else {
c.logf("magicsock: home is now derp-%v (%v)", derpNum, c.derpMap.Regions[derpNum].RegionCode)
}
for i, ad := range c.activeDerp {
go ad.c.NotePreferred(i == c.myDerp)
}